How to Fix Car AC Blowing Hot Air Problem the Right Way?


How to Fix Car AC Blowing Hot Air Problem the Right Way?

It is common for car owners not to know how to fix car AC blowing hot air issues in their vehicles. Some of them do not even know the reasons for that particular issue. It is crucial to know those things for anyone who owns and drives a car regularly. Leaving a problem in a vehicle for too long may cause it to get worse and affects other sections of the car itself in the future.

Regarding the appropriate ways of fixing car AC blowing hot air (hot air coming out of car ac) issues, it is important to know the causes. There are common potential causes that prevent the air conditioning system in a car to work appropriately. Checking each one of the possible reasons is necessary to determine the appropriate repair for the issue itself. It can be necessary to bring the car to a repair shop for this.

The simplest reason for a hot air issue in any car AC system is the low level of refrigerant. It can happen because of a leak or because the owner forgets to refill it. Patching the leak and refilling the refrigerant to the appropriate level will do the job of dealing with this particular issue. Yet, the problem may remain there since there are other causes of this problem.

How to fix car AC blowing hot air problem when it is not the refrigerant that causes it? Checking the condenser at the front section of the car is the next thing to do. A clogged condenser may lead to a hot air problem since it prevents the AC system to perform the so-called heat exchange. Cleaning the condenser can be enough to handle the issue in no time.

how to fix car ac blowing hot air

A bit more complicated cause of this issue is a problem with the compressor. The so-called compressor is the heart of the AC system in any car. Therefore, the system will not work when the compressor is not operating appropriately. Fixing the compressor is the only way to get out of the hot air issue of the car AC system when it is the cause.

It is recommended to bring the car to a car repair shop for the proper repair and maintenance of the air conditioning system. It is that way because doing something with the vehicle improperly often leads to new problems which require more money to fix. So, it is best to trust a local car repair shop on how to fix car AC blowing hot air issue appropriately.

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Understanding the Issue of Car AC Blowing Hot Air and Making Noise


Understanding the Issue of Car AC Blowing Hot Air and Making Noise

Car owners must understand issues with their cars, such as car AC blowing hot air and making noise. It helps car owners to consider the best thing to do concerning the problem. More importantly, it gives an idea about where to bring the car for repair to fix the issue. It is that way because some issues with cars require the professionalism of a specialist to repair them appropriately.

What about the problem of car AC blowing hot air (my car ac blowing warm air) ? It is one of the most common issues that happen to automobiles, indeed. Unfortunately, there are car owners who often ignore the issue when it starts to happen to their cars. It leads to a worse situation in the AC system and requires more money for repair or even replacement.

Of course, there are common reasons for this issue in any car. According to professionals in the car repair field, the AC system is one of the most complex ones in any vehicle. Therefore it is best to bring it to a repair shop immediately when the AC system behaves improperly. It gives the chance for the mechanic to inspect the system thoroughly to find the culprit of the problem.

car ac blowing hot air and making noise

A faulty condenser is one of the reasons that car AC blowing hot air and making noise. A condenser maintains the refrigerant of the AC cool when the AC is functioning in the car. Therefore, hot air will come out of the AC outlet when there is something wrong with the condenser. It is that way because there is nothing that cools the refrigerant.

A refrigerant leak or shortage is another reason for this particular issue. The so-called refrigerant is a liquid that moves within the AC system. It circulates and removes humidity and heat from the interior cabin. It is necessary to keep the refrigerant at the appropriate level for the AC system to work properly.

Lastly, there is also the matter of a broken compressor which may deliver hot air to the cabin from the air conditioning system. A compressor pushes the refrigerant to circulate in the entire system appropriately. it tends to break after a long period of inactivity. It is important to maintain the functionality of the compressor by turning it on regularly.

All of those things may not be discoverable without taking the car to a repair shop. So, it is best to contact a nearby car repair shop when the issue of car AC blowing hot air and making noise strikes.

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How Much Does Car AC Blowing Hot Air Cost of Repair?


How Much Does Car AC Blowing Hot Air Cost of Repair?

The car AC blowing hot air cost is one of many maintenance expenses any car owner needs to know. An improperly functioning air conditioning system in a car is nothing but uncomfortable. Therefore, it is best to deal with that particular issue right away. Keeping the repair on hold will bring the risk of damage to other parts, indeed.

So, how much does it cost to fix the issue of car AC blowing hot air (air conditioner blowing warm air in car)? Fortunately, the repair cost for that problem is not expensive. Depending on the make and model of the car and the air conditioning system, the cost ranges from $150 to $300. That is the cost to get this repair or maintenance done by professionals nearby.

It is possible to reduce the cost by purchasing a DIY kit to do it at home. It is recommended to find a toolkit that costs between $40 and $60 for the appropriate result of the maintenance. Nevertheless, taking the car to a repair shop comes with the benefit of a thorough inspection. That inspection is necessary to fully understand what is happening with the AC in the car.

How Much Does Car AC Blowing Hot Air Cost of Repair

Therefore, it is best to spare approximately $500 for the car AC blowing hot air cost in any trusted repair shop nearby. It requires more time and money to complete than doing it at home, indeed. Yet it comes with a better chance of eliminating the issue and returning the AC system to its best performance appropriately. So, why bother doing it at home?

Keep in mind that the cost estimation as mentioned earlier applies only to maintenance. It can be more expensive when there are some parts within the car air conditioning system to replace. It highlights the importance of a thorough inspection before the maintenance or repair for accurate measures. It also underlines the importance of doing maintenance regularly.

Professionals in the business of car AC maintenance and repair suggest the treatment every 100,000 miles. It reduces the chance of the system getting too bad that it cannot be repaired anymore. Keep in mind that replacing the entire air conditioning system is nothing but expensive. So, it is best not to ignore the hot air blow that comes out of the car AC.

There is no need to hesitate in asking the repair shop regarding this particular matter. proper explanation regarding the issue will lead to the appropriate repair and maintenance. It also guarantees the expense of car AC blowing hot air cost delivers the best outcome.

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An Effective Solution to Solve Car AC Blowing Hot Air when Idle


An Effective Solution to Solve Car AC Blowing Hot Air when Idle

Some car owners are having a problem with the car AC blowing hot air when idle. Do you have the same problem? The information below explains the reason why your car AC blowing hot air – air conditioner blowing hot air when idle. You will also understand the way to fix this problem and use the AC as before.

The Cause of Car AC Blowing Hot Air when Idle

One of the reasons why your car AC produces hot air instead of cold air when idle is because of the cooling fan. There will be a faulty cooling fan in the car AC system. The cooling fan should work as its function to keep the radiator and condenser cool during the idling.
Imagine if there is a problem with the cooling fan. It means the radiator and condenser are getting so hot when idling the vehicle. Indeed, it affects other components in the vehicle.

As the radiator and condenser get hotter, so does the vehicle. Letting this condition without any proper solution trigger an overheating problem. At a certain point, it damages the AC system. Finally, you can’t use the AC system at all.

The Way to Repair Car AC That Blows Hot Air when Idle

Now, you know the reason why car AC blowing hot air when idle. So, what do you have to do to solve this problem? Replace the cooling fan if it is the cause of the problem. Follow the steps below to replace the damaged cooling fan with a new one.

car ac blowing hot air when idle

Instructions to Replace Car AC Cooling Fan

First, you should identify the compartment to access the cooling fan. It is the part you should remove first. The function of removing the part is to access the car AC cooling fan. Then, carefully remove all the bolts, screws, and clips to open the component and reach the fan.

Second, find out the battery inside the vehicle. Disconnect the battery terminal once you find it. Start disconnecting the negative cable first and the positive cable. It is a crucial step to prevent the cooling fan from being energized. Touching this component without disconnecting the battery terminal is so dangerous to do.

Third, remove ductwork, hoses, bracketry, and other components. These components will interrupt you while pulling the cooling fan or radiator out. Fourth, unplug all the electrical connectors for the cooling fan. Remove also all the mounting hardware.

Fifth, it is time to remove the cooling fan assembly from the vehicle. Install the new cooling fan on the vehicle. That’s it! A car AC blowing hot air when idle issue is solved.

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4 Most Common Causes That Make a Car AC Blowing Hot Air After Recharge


Most Common Causes That Make a Car AC Blowing Hot Air After Recharge

There is a case where your car AC blowing hot air after recharge. Indeed, it is something that you don’t expect. A car AC blowing hot hair (car blowing hot air instead of cold) can be caused by a variety of problems. Check the information below if you feel the hot air from your AC once you recharge it.


Leakage is the most common reason why a car AC produces hot air. One of them is the leakage of the freon. The function of freon is to cool the warm air before spreading it inside the car. This feature should do its function perfectly otherwise there is a change in the air temperature.

Indeed, a leak in freon is a big problem. This issue affects the hose, a loose gasket, or a loose connection. So, check the freon and find out the leaky part when your car AC produces hot air. For a safer repair process, bring the car to the dealer. Let professional technicians fix it.

Blend Air Door is Stuck

A blended air door is a mechanism to close off the warm air across the ventilation system. Then, the AC system spread the cold air inside the car. So, is there any relationship between car AC blowing hot air after recharge with this mechanism? Yes.

The common problem is that the mechanism is stuck. If so, the system will only produce warm air even when turning the AC system on. Fixing this issue takes time because you have to remove the dashboard first to reach the components. You should call a trusted technician if you don’t have any experience yet in handling this problem.

The compressor Doesn’t Engage

A compressor is a vital component in a car AC system. The performance of other components depends on the condition of the compressor. For example, a compressor will compress the freon. Freon will expand and produce cold air.

car ac blowing hot air after recharge

The process is interrupted when the compressor doesn’t work. It means that the air in the system won’t be as cold as you wish. This problem happens because of low freon levels, electrical problems, or engine overheating.

Electrical Problems

It is also the main reason why a car AC blows hot air and doesn’t work as you expect. Besides a problem with the compressor, you also should check the fuse. The fuse on an AC system may blow. If so, the AC system will stop working. Replace the blown fuse with a new one and try the AC system.

Your car may have one of the problems above if the car AC blowing hot air after recharge. Some car owners may successfully repair the problem by themselves.
In case you don’t have any skills, bring your vehicle to the dealer. The earlier you bring the car to the dealer, the better before the main problem affects other components and makes it worse.

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3 Simple Tricks to Repair Car AC Blowing Hot Air by Yourself At home


Simple Tricks to Repair Car AC Blowing Hot Air by Yourself At home

Be careful if your car AC blows hot air! A car AC blowing hot air is a sign that there is a problem with its components. So, stop driving the car and check the components. Here, we have some tips to repair car ac blowing hot air. The information below will be so useful if you love to fix something by yourself.

Recharge the Refrigerant

You should check the refrigerant first when the AC air temperature is higher. It can be because of an insufficient amount of refrigerant in the system. A low level of refrigerant will make the AC temperature higher. As a result, it blows hot air inside the car.

The way to repair this problem is by adding refrigerant. Ensure that the refrigerant is sufficient enough before igniting the car and turning the AC on. It should be back to normal if there are no other problems.

Recharge the coolant with an AC recharge kit. You only have to open the hood of the vehicle. Check the type of refrigerant your vehicle uses under the hood. Ignite the engine and turn on the AC. Set the AC to the coolest level and the fan to the maximum speed.

repair car ac blowing hot air

Now, find out the low-pressure service port with an L label. Connect the AC recharge kit. What if the air remains hot even after adding the refrigerant? It can be because of leakage. It is a serious problem. Only certified technicians can handle this problem.

Clean the Condenser

The condenser is another you should check regularly to keep the performance of the AC system. Dirt and debris may stick around the condenser while using the car. The more often you drive the car, the dirtier the condenser.

Thick dirt blockage or breakage of the condenser. As a result, the car AC blows hot air. Cleaning the condenser is not as simple as you can imagine. You still have to remove the front bumper first to get access to the condenser.

Now, use a pressure washer to clean the condenser. Only because you want to clean this component faster doesn’t mean that you have to use a high-pressure setting. It damages the fins. Instead of doing that, repair car AC blowing hot air by cleaning the condenser with a low-pressure setting.

Clean the Evaporator

The evaporator is another component you should clean if your vehicle AC blows hot air. Dirt and debris stick on the fins and block the airflow through the evaporator. Remove the entire dashboard to reach the evaporator and clean it.

At least, you know 3 ways to repair car AC blowing hot air by yourself at home. Call a professional technician in case the tricks above don’t work.

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Why is My Car AC Blowing Hot Air? 3 Possible Causes You Should Consider


Why is My Car AC Blowing Hot Air? 3 Possible Causes You Should Consider

tin pan – Why is my car ac blowing hot air – You may be shocked because your car AC blows hot air. Then, you are asking why is my car ac blowing hot air while trying to set it. Relax! Car ac blowing hot air – car air conditioner blowing hot air is a common issue. The critical thing you should understand is the reason why it happens and how to fix it right away. The information below will help you.

There Is a Problem with the Electrical System

The first thing you should check when your car ac blows hot air is the electrical system. It is the most common cause of this problem. Ensure that the components, such as fuses, relays, and switches work well.

why is my car ac blowing hot air

The AC will not work properly if there is a problem with one of the components. Don’t get shocked if the AC suddenly stops working if you don’t fix this problem. Slowly but surely, this problem affects other components.

Despite it being the most common issue in cars with an AC system, not all car owners can fix it. It will be better if you call a professional mechanic to fix this problem. Fixing the AC components without sufficient knowledge, skill, and experience will make it worse.

A Problem with the Refrigerant

The next part you should check is the refrigerant or coolant. It is a fluid to cool the passenger cabin. This fluid is about to circulate throughout the air conditioning system. This component should be tightly sealed. The seal prevents the fluid from evaporating.

So, why is my car ac blowing hot air? Is there any relationship with the refrigerant? Yes. The most possible problem is there is a leak somewhere around the refrigerant. It is useless to refill the coolant if the leak is still there.

Fix this problem immediately otherwise this small issue will damage the AC. Imagine if you have to replace your car AC system only because of a small leak in the coolant. There are no hacks to repair this problem. Call a certified mechanic to fix the leak.

A Terrible Problem in the Condenser

The condition of the condenser also determines the temperature of the air from the AC. So, the condenser can be in a bad condition when your AC blows hot air. It is because the condenser helps to reduce the temperature.

Mostly this problem is caused by dirt and debris that is trapped inside the condenser. The more dirt or debris in the condenser, it causes a blockage or even breakage.

Try to clean the condenser and turn the AC on. The air should be back to normal after the cleaning process.
Now, you don’t need to ask anymore why is my car ac blowing hot air. You have got the answer and the things to do to solve it.

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Try This Automotive Air Conditioning Repair at Home


Even the thought of traveling in the sweltering summer without air conditioning seems terrible. The air conditioner frequently develops issues due to the daily wear and tear your automobile endures. While the majority of us end up spending money getting it done, there is something you can do that is easier.

You can fix it yourself, for a fraction of the cost of a mechanic’s visit, by doing some simple vehicle air conditioning repairs. Whether you drive a sedan or a hatchback, the hack is straightforward to execute. Yes, you can do this if your car’s air conditioner breaks. Read : AC doesn’t work in car

How to Repair Automotive Air Conditioning

Identification always marks the start of the procedure. Analyzing the A/C system is equivalent to checking the warning indicators before replacing your oil pump. Let’s break down the procedure into steps.

Check the Air Flow

Determine the temperature of the air as the car is started and the air conditioner is set to the highest setting. Even though it is cool, it could not be as cold as it should be. In this instance, air movement could be the issue. By changing your car’s cabin air filter, it can return to normal.

Check Electrical Problems

Ensure that the cooling fans are operating properly. If not, there could be an electrical problem. Check the A/C compressor as well. This is carried out to ascertain what repairs are required. Make sure the pulley is spinning with the rest of it by checking in the engine compartment. When a clutch is engaged, that occurs. The AC compressor might be damaged if the center doesn’t spin. You may take care of this issue on your own by replacing or adding refrigerant.

Check for Other Problems

Most compressors have a wire connecting them to the clutch. Unplug by locating the connector, which is probably in the center. Utilizing your battery, check its current. It must be replaced if there is no current. If this is the case, you need to call specialist assistance.

Check for leaks if everything is functioning as it should. Leak detecting kits make it simple to do so. The kit box includes instructions for the simple process. If you see leaks, follow one of these crucial maintenance advices since your vehicle will require expert auto air conditioning repair.

If there are no leaks, then it might be a refrigerant problem.

Preparing the Refrigerant

You’ll need to get the appropriate refrigerant for your vehicle. R134a is used in every car made after 1995. Older versions employ 12. If your own car belongs to the latter group, you must take it to a mechanic.

Temperature control is the most crucial aspect of car air conditioning. You must use a thermometer to measure the surrounding temperature. Why? due to the fact that the refrigerant uses up various amounts of space in the container and the air conditioning system depending on the temperature.

Dealing with The Port

Now find the air conditioning system’s low-side service port. Simply follow the lines that emerge from the compressor until you reach a nozzle that is located at the rear of the vehicle. Remove the cap and use a piece of rag to wipe off the port, the line, and the cap. If required, wipe with brake cleaner.

The charging hose should now be linked to the port with the nozzle of the refrigerant container at the other end. If the kit includes a gauge, attach it to the gauge before the nozzle. Allow enough time so that the can remains outside the engine compartment. Keep checking the surrounding pressure throughout.

Refrigerant Filling

Till the seal is opened, turn the can’s valve. The moment the seal is broken, the refrigerant will be discharged. Hold the container firmly in place as the refrigerant runs through. As the gauge shows, keep an eye on the outside pressure.

Fill the tank as necessary until the gauge reads full pressure. You will be able to simply identify any leaks on the line if there are any. You’ll need to take your car to the mechanic if that’s the case. If not, just snap the lid shut once the refrigerant has been poured in. Your automobile’s A/C is back and cooling your car perfectly.


Can I repair the compressor in my car myself?

Normally, a professional should replace a compressor, but if you are skilled with your hands, you can do it yourself at home. Additionally, you may save a sizable sum of money by doing the work yourself.

What to check if the car’s AC isn’t cooling?

The six most likely reasons for your air conditioner not being cold are listed below.

  1. Freon Leak
  2. You need to recharge your air conditioning.
  3. The door of your Blend Air is stuck.
  4. The AC compressor is not in operation.
  5. A clogged or damaged condenser
  6. Electrical issues

What are the most typical AC issues with cars?

  1. A refrigerant leak is a typical auto air conditioning issue. A refrigerant leak is one of the most frequent issues that can harm your car’s air conditioning system.
  2. Blockage in the condenser.
  3. A damaged condenser
  4. Poor Fans
  5. A faulty compressor

How much does diagnosing an AC issue in a car cost?

On average, for the diagnosis and the service, it will cost around $200 total.

What is the ideal lifespan of a car air conditioner?

8–10 years. Car A/C systems often don’t need maintenance for eight to ten years. The compressor for the air conditioning in your car is most likely to last that amount of time. Consequently, the sooner you might need to get your car’s A/C fixed, the warmer the environment where you reside.

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Car AC Stops Working When Hot Outside: Causes and Solutions!


An absolute horror if you have to drive your car on a hot day and the air conditioning stops working or doesn’t cool the car off enough. We are confident that you won’t want to drive while the engine is heating up and continuously pushing hot air into your car while the temperature outside approaches 100 degrees.

These are the reasons why you need to track down those responsible for any AC-related issues. What are the reasons why your car’s air conditioning stops functioning when it’s hot outside, and how can you fix it? Let’s read the article together and discover the truth!

Why Car AC Fails When It’s Hot Outside

A car’s air conditioner is either not cool or only sometimes cool.

One of the most typical issues is when it is hot outside. This indicates that there are issues with the car’s air conditioning system. To prevent the problem from getting worse, shortening the lifespan of numerous crucial components, increasing fuel consumption, and degrading your driving experience, the reason must be identified and handled quickly.

When traveling in hot weather, your air conditioner may encounter any of the following issues:

  • Poorly functioning air conditioning system: This is when the air conditioner is on full blast, but you still don’t feel cool while driving, and there may also be times when the air leaving the cabin smells unpleasant.
  • Even if the cooling system has been turned on, the air conditioner loses its ability to cool entirely in this situation.

7 Reasons Why Your Car’s AC Is Not Working Well in Hot Weather

When it’s hot outside, your car’s air conditioning may cease working for a variety of reasons, including the following:

Clogged filter

A blocked air conditioner filter is frequently one of the reasons why the air conditioner stops operating or keeps running but does not provide adequate cooling.

A Dirty Outdoor Unit

The outside unit is often mounted in front of the engine fan and radiator. This component serves as a heat exchanger, dissipator, and heat discharger. Too much dirt buildup on the component may result in poor heat dissipation, which can significantly reduce cooling effectiveness and render your AC inoperable.

Blocked Condenser

The condenser’s job is to transform Freon gas into liquid form. It takes place during a heat exchange procedure in which the refrigerant’s heat is forced out and exchanged with ambient air. The refrigerant will cease flowing if the condenser is broken, which will stop the flow of cool air.

Refrigerant Problem

Your AC system has a gas shortage since it hasn’t had a gas refill in a while. The air conditioner will work inefficiently as a result of this circumstance and won’t pump cool air into your car.

A refrigerant gas leak is also a scenario that might cause your air conditioner to stop working. The AC system will stop functioning when the pressure falls below the normal range.

AC Lines Freezing Up

The inside unit is in charge of absorbing and lowering the air’s temperature as it passes through. But with time, this area becomes dusty, conducive to the growth of germs and mold, and emits foul aromas. Over time, the interior unit will get frozen, with thick ice adhering to the louvers and holes and restricting airflow.

Faulty Electrical Systems

The circuit is in charge of regulating the functioning of the whole system; if the circuit or other electrical parts fail, the air conditioner will not function. Users should thus examine the circuit, the capacitor, and other components to determine the precise cause.

Problem with Cooling Fan

Your car’s air conditioning system may stop working when it’s hot outside for a variety of reasons, one of which is a cooling fan issue. The following factors might be at blame if the blower is turned on but is weak or not cool: shorted-circuit fan motor, defective capacitor, harmed contactor coil, or damaged electrical circuit

What to Do If Your Car AC Fails In Hot Weather?

Here are some things you can do if the case happen.

Clean and Change the Air Conditioner’s Regularly

Filters that are dirty will restrict the flow of air, which will impede the air conditioner’s ability to cool. Users should thus be mindful of routine cleaning to guarantee efficient device performance. Drivers may think about changing the air filter with a new one if there is an excessive buildup of dirt.

Based on operational circumstances and manufacturer guidelines, the replacement interval should be determined. Typically, car owners should change their air filter with a new one after 16,000 to 24,000 kilometers.

Drive Less in Hot Weather

You should avoid driving during the warmest parts of the day while it’s hot outdoors to save your AC system from stress.

Check The Whole AC System

Drivers should bring their cars to a dealer so that a specialist may examine every component and determine the problem’s root, fixing the issue that causes the car’s air conditioning to malfunction in hot weather.

To guarantee that the device’s operability is restored, the interior components also require a thorough cleaning. If a broken compressor is the root of your air conditioner’s inability to cool, you must fix or replace it. The kind of car and the air conditioner compressor’s manufacturer determine how much it will cost to replace the old one.

Routine Maintenance

An essential treatment for the condition of the car air conditioner not cooling is routine maintenance, particularly when the vehicle must frequently operate in a dusty area. Once a year, drivers should do maintenance on it to inspect and repair any damage.

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How to Maintain Your Car’s Air Conditioner


What you can do for car a/c maintenance and what should be left to a trained professional? Our car air conditioners become more important as summertime approaches, especially in the southern regions where the humidity may occasionally be intolerable.

Most people with a little mechanical skill can complete a few visual inspections and a few manual operations. Here are a few tips to ensure you know your air conditioner is prepared to combat the summertime heat on the road.

Checking The A/C System And Maintaining It

During the months when air conditioning isn’t available, cars operating in cooler northern areas need to operate their air conditioners for roughly 10 minutes each time. By circulating the oil throughout the system, this will keep the seals lubricated and stop them from drying out (which would cause the Freon to leak out.) Additionally, regular use of the air conditioner will help to dry up the air chambers and lessen the possibility of mold and fungus forming there and producing foul odors (or worse). Read : no air conditioning car

In addition to just operating the system on a regular basis, you should examine your air conditioner to catch issues early. Just almost everyone can perform this. The A/C condenser, which is situated in front of the radiator, is where we begin our under-the-hood investigation.

Freon is converted from a gas to a liquid in the condenser (it condenses). Anything that may prevent air from passing through the condenser, like a clogged insect screen, must be removed. The efficiency of the air conditioner will decrease if the condenser is constrained. With a garden hose fitted with a high-pressure nozzle, the condenser is simple to clean.

Engine Fan and Fan Belt Inspection

Checking the engine fan, which might be mechanical or electrical, is the next thing on our list. When an air conditioner is turned on, any electric cooling fan that is installed to the radiator must always be working.

If the fan is not working, the system may experience abnormally high pressures that can break system hoses and leak Freon and oil. This can happen if the fan is not functioning. One electric fan only has to be operating when the air conditioning system is on in certain systems that have two of them.

When you are driving your car and notice that the cold air coming from the air ducts rises significantly when the engine is idle, it is likely the cooling fan is not working.

If you have a mechanical clutch fan with a thermostat in the center, the air is supposed to tighten up and spin faster as it goes past the condenser and the radiator warms up. You may do a quick test to check the condition of the fan clutch.

Reach inside and manually turn the fan while the engine is still cold and off. The fan ought to rotate freely, and that is exactly what it ought to do. As you rotate the engine, you should encounter resistance or drag.

You probably have a faulty fan clutch if it is loose and spins freely while the engine is heated. As mentioned in the previous sentence, if the air coming from the air ducts is chilly when driving but heats up significantly when the car is idling, you probably have a bad clutch fan.

The next step is to visually inspect the fan belt. Look for fractures on the belt’s underside. If cracks are discovered, the belt has to be changed. To avoid applying too much pressure to the components being driven by the belt on older automobiles, a belt tension gauge is required while changing the belt.

These driven things may prematurely fail as a result of this, but this is not an issue with more recent cars since they have spring-loaded belt tensioners that apply the proper amount of tension to the belt.

Checking Operation

Start the engine, set the fan speed switch to the maximum setting, and the temperature control to the coldest setting. A clutch that will engage to spin the internal components is located on the front of the air conditioner compressor. You should be able to drive pulley turning together and see the clutch if you take a close look at the compressor. It is common for the clutch to turn on and off around every 20 to 30 seconds. When the clutch abruptly turns on and off every few seconds, the system likely needs more Freon.

What You Do Need A Professional For

10% to 15% of the Freon in air conditioning systems might be lost annually, well, this is where you should get a qualified expert’s assistance. There is a specific amount of Freon that has to be in every air conditioning system. Typically, a tag may be found on the radiator housing’s top, the hood’s bottom, or the chamber housing the system evaporator.

For the system to operate effectively and properly, the kind and required quantity of Freon are listed on this tag in pounds and ounces. Because oil is carried along when freon leaks, you can frequently see the leak when it occurs. A leak is likely present if greasy or black residue is visible on fittings or hoses. Other methods of locating leaks include using an electrical leak detector or a dye that detects leaks.

It is not a good idea to just add more Freon to a system if it is only low on it. There is no way to determine how much Freon is already in a system, and if too much is added, the compressor might be harmed or excessively high pressure could lead to hose ruptures. The proper approach to recharge an air conditioner is to empty it completely, start over, and add the precise amount specified on the tag described before.

DIY Recharge Kits?

The DIY recharge kits available at most parts stores should be avoided. You must keep in mind that an air conditioner may not be functioning for other reasons besides the depletion of Freon.

What would happen if the system’s issues weren’t caused by low Freon alone? The compressor may be destroyed if Freon is introduced to an already-full system because liquid Freon will enter it, or the system hoses may rupture. That is all not good.

Is Dripping Water A Sign?

You can see water dripping from the vehicle’s undercarriage while the air conditioning system is running. This is completely normal and is condensation from the evaporator that has been removed from the passenger compartment.

Water running in on the passenger-side floor rather than beneath the car is a sign that the condensation drains could be blocked. Where water has been standing for a while, fungus and mold might develop, which can clog the drain port or the hose leading outside. Most of the time, the vehicle’s undercarriage will need to be cleansed of this.

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How to Repair Automotive A/C


Step 1: Check the freon


To check the pressure of your freon, you will need a set of manifold gauges.

Here are some general recommendations for the pressures and temperatures of an air conditioning system dependent on the outside temperature. As a general rule, keep in mind that your real temperatures and pressures will fluctuate based on the air’s humidity level and the state of your system.

It is a good idea to keep a water hose close by and spray water on the air conditioner condenser when checking the freon level while the car is running at idle. In front of the radiator is where you’ll find the condenser. Read : Why is my ac not blowing air in my car

For vehicles currently running with freon R-134a only:

Outside Lowside Highside Center Vent Temp
90F 35-40 psi 190-225 psi 44-50 F
80F 30-40 psi 190-220 psi 43-48 F
70F 30-40 psi 190-220 psi 44-48 F
60F 28-38 psi 130-190 psi 44-46 F
120F 55-65 psi 320-350 psi 70-75 F
110F 50-60 psi 250-300 psi 68-74 F
100F 40-50 psi 200-250 psi 52-60 F


Run the fan on High, leave all windows open, and rev the engine to 1500 rpm when using R134a. The outside air temperature in degrees Fahrenheit should be between 2.2 and 2.5 times the high side pressure in PSI. For instance, if it’s 90 degrees Fahrenheit, the high side shouldn’t exceed 225 PSI.

Here is a helpful discussion for troubleshooting systems that use freon R-134a.

Problem: Compressor discharge pressure is low.


  1. System leak
  2. Faulty expansion valve
  3. The suction valve is shut
  4. Freon deficiency
  5. A receiver dryer with a plug
  6. Leaking compressor suction valve
  7. Defective compressor reed valves


  1. Fix system leak
  2. Replace valve
  3. Turn on valve
  4. Add freon
  5. Replace the dryer, and
  6. Replace the valve.
  7. Change the reed valves

Problem: Compressor Discharge Pressure at a High Level


  1. Air in the system
  2. a clogged condenser, and
  3. a blocked discharge valve
  4. Overcharged system
  5. Not enough condenser air
  6. A slack fan belt
  7. Condenser is too far from the radiator or not centered on the fan.


  1. Do system recharge
  2. Do condenser clean up
  3. Get the valve open
  4. Remove some of the refrigerant
  5. Install sizable fan
  6. Adjust the fan belt.
  7. Center and measure the distance.

Problem: Suction Pressure Is Low


  1. A lack of refrigerants
  2. A damaged compressor piston
  3. A leaky compressor head gasket
  4. Hose that is bent or flattened
  5. Leaking compressor suction valve
  6. Trash in the expansion valve or screen
  7. Moisture in the system


  1. Give additional refrigerant
  2. Replace the compressor
  3. Also replace the head gasket
  4. Change the hose.
  5. Alter the valve plate
  6. Replace the dryer
  7. Replace the dryer

Problem: Suction Pressure is High


  1. An inadequate expansion valve
  2. Overcharged system
  3. A jammed expansion valve
  4. Reed valves on compressors
  5. A compressor’s head gasket leak


  1. Get the valve tightened
  2. Remove some of the refrigerant
  3. Replace the expansion valve
  4. Change the reed valves.
  5. Change the head gasket

Problem: Compressor not functioning

  1. A faulty belt
  2. A damaged clutch wire or a lack of 12 volts
  3. Damaged piston in a compressor
  4. thermostat defect
  5. Defective clutch coil
  6. Low pressure switch has turned off clutch power due to low refrigerant.


  1. Change the belt
  2. Check for electricity or fix the wiring
  3. Change the compressor
  4. Change the thermostat
  5. Change the clutch coil
  6. give additional refrigerant

Problem: Evaporator Isn’t Cooling


  1. frozen coil; high switch setting
  2. slipping drive belt
  3. hot air leaks
  4. The receiver dryer is plugged
  5. Broken capillary tube
  6. Low refrigerant levels
  7. High head pressure
  8. Suction pressure is low
  9. Suction pressure is high
  10. A faulty expansion valve
  11. Freezing of the expansion valve


  1. Reverse the thermostat.
  2. Adjust the belt
  3. Look for vents or holes.
  4. Change the dryer
  5. Change the expansion valve
  6. Give additional refrigerant
  7. already explained above
  8. already explained above
  9. already explained above
  10. Change the expansion valve
  11. Remove and replace the dryer

Step 2: Flushing and Expantion Valve

You will need to remove the expansion valve, drier, and the compressor if you determine that the A/C system has to be cleansed to get rid of dirt and oils. PLEASE DO NOT FLUSH THROUGH THESE PARTS. Additionally, as oils often do not mix well, if you are retrofitting your system from R-12, you will need to drain off all the old mineral oil. Mixing oils or refrigerants will cause what mechanics refer to as “the black death.”


You can discover the evaporator to be exceedingly unclean once you’ve taken it out of the car. Remember to be extremely careful not to get water in the pipes that the freon runs through when cleaning your mines in the shower.

It wouldn’t be a terrible idea to repair the expansion valve and do your best to wrap it in some thermal insulation material if you had previously spent all that time pulling it out of the car. To keep it in place, I used tape and some packaging material. (On second thought, perhaps glue would have been a better choice.)

The process of flushing All you need to do is spray an AC cleansing substance into the freon pipes, which I won’t go into detail about. After waiting 20 minutes, blow shop air over it to clean it out. I had the good fortune to have access to my school’s shop compressor. You will probably have to wait for the tank to replenish if you use a potable one because it won’t be able to keep up with demand.

Step 3: Vacuuming

Every time the air conditioning system has been opened or pressure has dropped, it is crucial to replace the dryer. Due to the fact that the dryer absorbs any moisture that may have entered the system. Make careful to drain the oil from the old dryer before adding the equal quantity of new oil to the new dryer when installing a new one. Since the dryer loses its effectiveness after about two hours outside, do this shortly before cleaning.

It is now time to perform a vacuum. If you tend to use general purpose vacuum pump and it does not fit the manifold gauge hoses, then you might want to consider visiting your neighborhood a/c supply store where, more often than not, you may get the correct fitting at a reasonable price. If you already have an air compressor, you might want to consider an air-powered vacuum pump, which costs less than $50, as electric pumps can cost up to $200.

You must remove air and moisture from the system after the vacuum pump is attached. It is advised to carry out this action when the temperature is greater than 80 degrees. So, if at all possible, try to avoid doing it in the dead of winter. Allow a vacuum pump to operate for 20 minutes when it has achieved almost 30 in/Hg (inches of mercury), then turn it off.

Turn on the pump to remove the water if the vacuum begins to drop somewhat since this indicates that some water has evaporated. After that, let the vacuum sit for at least 45 minutes. If the pressure cannot be maintained, a leak somewhere in the system must exist. Before adding more fluid, make sure to fix it.

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Car Air Conditioning Repair: Troubleshooting


What is “Black Death?”

Although the Black Death is not the same as the devastating virus that swept through Europe in the fourteenth century, a car’s air conditioning system will become infected just like the plague. After refrigerant degrades, Black Death begins inside the compressor. Since refrigerant functions as a working fluid, similar to how motor oil provides lubrication to safeguard the engine, a breakdown will cause unsightly wear, beginning in the compressor.

From there, the corrosive metal fragments produced by compressor failure can enter the remainder of your air conditioning system and cause havoc across the entire system. Before you realize it, the airflow and all of the cold air will be long gone. Read : Why did my ac stop working in my car

An A/C Performance Check is your best line of defense against the Black Death.

Why Does My A/C Have Weak Airflow?

We sympathize with your suffering due to poor airflow. Any of us would go mad just from the perspiration. However, there are numerous variables at work. Take the correct action and have it checked at if you observe reduced airflow early on rather than later to prevent further potentially disastrous A/C system damage.

Main reasons for poor airflow:

  • The evaporator core may have developed mold or mildew as a result of leftover moisture during the cooling operation. Your air vents won’t receive enough air when this happens.
  • There is a loose hose.
  • The exhaust fan has burned out. Air won’t flow very well if the fan is not blowing.
  • Seals (Not those seals by the dock, please). Air flow may reduce due to leaks in core case seals and evaporator, or blower house seals. Because they are so delicate, A/C ventilation systems must remain sealed. The moment they are opened, the entire system is put at risk.

Are There Any System Indicators That Might Notify Me Of An AC Issue?

The majority of the cars, no. However, some cars include Driver Information Centers (DIC) that could provide the status of a variety of car systems. For more details, read your owner’s manual.

Why Isn’t My Air Conditioning As Cool As It Used To Be?

There are several causes for an air conditioning system to lose its cool. As soon as you begin to experience this alert, bring your vehicle to the dealer; delaying could result in the need for a larger repair. Here are several things that could make your AC lose its cool.

The A/C is not cool as it used to be because of some of these reasons:

  • An o-ring, hose, seal or component failure leading to a Freon leak
  • A blocked charging hose or expansion tube for the refrigerant
  • Failure of the compressor clutch
  • Blower motor failure or a faulty blower motor resistor
  • Damaged or malfunctioning evaporator or condenser
  • Vacuum leaks
  • Faulty solenoid, blend door, fuse, relay, control module, or switch

Leaks may cause great harm. An “open system” is what you have when an air conditioning system starts to leak. Your repair will be less expensive if you or your expert find the leak quickly. Unfortunately, moisture will have probably infiltrated your A/C system and may have harmed other crucial and expensive parts if a leak has been damaging your cool air for a while.

The Air Conditioner Starts Out Cool And Then Gets Warm, What is The Problem?

There is never just one right answer, as is the case with many complex stories. A/C units are a temperamental lot. The best course of action for any of the following listed symptoms is to have the dealer examine your system.

From cold to hot, including all associated symptoms:

  • The clogged expansion valve: Your evaporator receives the correct amount of refrigerant through the expansion valve. The refrigerant cannot flow into the evaporator if the valve is closed. If there is moisture present and the valve is clogged, the refrigerant will begin to freeze the valve completely.
  • Compressor clutch malfunction: If your compressor’s clutch isn’t engaging, it won’t be able to maintain the proper pressure. This will cause hot air.
  • The case of the blown fuse Sometimes fuses short out. Your A/C system’s fuse could blow, cutting off power to some components.
  • The worst enemy of an air conditioning system is a leak, which can occur due to corrosion or moisture buildup. Unpleasant corrosive acids will eat away at seals and components when moisture and refrigerant combine, leading to a leak.

What is The “Gym Locker” Smell Coming from My Air Conditioning Vents?

It appears that you are dealing with an odor issue. There are a few problems that could be the source of this odor.

The Main Causes of “Gym Locker” Smell

  • Outdated and dirty air filter in the cabin.
  • Evaporator case with mold. Water accumulating in the evaporator case due to a clogged case drain is a problem for many cars. Mold will build up and turn into something worse.

How Can An AC System Leak Be Detected?

Discovering an A/C system leak is pretty tricky, but here are 2 methods of finding an AC system leak that you might want to know.

Finding leaks

  • Black light-activated dyes. You read correctly. Many refrigerants are pre-mixed with a unique UV dye that glows when illuminated by black light. Your A/C system will be examined using a black light to detect whether any dye is present.
  • Invite the “sniffer” in. A sniffer is a unique tool that focuses on the chemical constituents of the refrigerant.

What Causes An A/C System Leak?

Age and humidity In a nutshell. Additionally, with time, rubber hoses and seals can degrade and lose their elasticity, allowing moisture and Freon to leak into your car’s A/C system. Moisture is the deathblow for your air conditioning system because it mixes with the refrigerant to form a corrosive acid that destroys the system.

Just a quick fact: Moisture can harm your accumulator, receiver, or dryer. Keep in mind that once exposed to an open system, these devices that remove moisture from the A/C system will eventually stop working (leak or crack).

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