Causes and fixes for Squealing AC units in your car

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Home ยป Causes and fixes for Squealing AC units in your car

Hearing Noises from Your AC?

If you’ve been hearing noises coming from your AC, there’s a few things it could be, and we will go over pretty much every aspect of this issue in our article. We will look at the following:

  • What are the sounds coming from your AC unit?
  • What can be the causes of the squeling from your AC unit?
  • What can you do to fix these issues?
  • Are there other issues that could cause these sounds?

-First, check to see if any of your vents are blocked. If they are, clear them and see if the noise goes away. If it doesn’t, it could be that your air filter is dirty and needs to be replaced. Another possibility is that one of your AC’s coils is frozen. This can happen if the AC isn’t sized correctly for the space or if the air flow around the unit is restricted. Either way, it’s best to call a professional to take a look and diagnose the problem.

Is your car making unusual noises?

If your car is making unusual noises, it usually isn’t a good thing and that something is wrong, or about to go wrong. While you might want to take it to a mechanic to have it checked out, there are a couple of things that you can do before you go there ( depending on how mechanically inclined you are). It could be something as simple as a loose part, or it could be something more serious. If the problem is ignored, it could lead to more expensive repairs down the road, but for this article we are going to take a look at a couple of the reasons why your car is making sounds when the AC is turned on.

a large car engine exposed with belts and lines exposed
Don’t worry its not as scary as this picture looks like

And don’t worry; some of the possible fixes are easy enough for you to do at home, so it could save you some time just reading over this article.

Why Is My Air Conditioner Making a Weird Noise & How Do I Fix It?

There are a few reasons why your air conditioner might be making a weird noise. One possibility is that the unit is low on refrigerant. This can happen if there’s a leak in the system. Another possibility is that something is blocking the airflow, such as a dirty filter or a bent fan blade. Or it could be that one of the components is starting to fail, such as the compressor or the condenser.

If you’re not sure what’s causing the problem, it’s best to call a professional for help. They can inspect the unit and diagnose the issue. Once they know what’s wrong, they can give you an estimate for the repairs.

Reasons for Car AC Compressor Clutch Failure?

A car’s AC compressor clutch is responsible for engaging and disengaging the compressor, which at its most basic level, turns your cold air on or off. When the clutch fails, it can cause a number of problems.

One reason for compressor clutch failure is simply worn down over time or that it has a tear which is preventing it from working right. Over time, the parts can wear down and break. This is especially true if the car isn’t serviced regularly.

Another reason for failure is the lack of lubrication. The clutch needs lubrication to function properly. If it doesn’t get enough lubrication, it can fail. This can be due to a problem with the car’s lubrication system or simply insufficient lubricant.

yet another reason for failure is contamination. It can fail if the clutch becomes contaminated with dirt or other debris. This is usually due to a problem with the car’s air filter or intake system.

Finally, improper installation can also lead to compressor clutch failure. If the clutch is not installed correctly, it can fail prematurely. This is often due to incorrect tension on the belt or other installation issues.

Reasons for Compressor Bearings and Pulleys Fail?

There are several reasons why compressor bearings and pulleys can fail. One reason is improper installation. If the bearings are not properly seated in their housings, they can become misaligned and cause premature wear. Another reason is the lack of lubrication. Bearings and pulleys need to be properly lubricated to prevent excessive wear. Without proper lubrication, the bearings can overheat and fail. Finally, contamination can also cause bearing and pulley failure. If dirt or other debris gets into the bearings, it can cause them to seize up and fail.

How to solve the Problem of AC squealing Noises?

The problem of AC squealing noises can be solved by checking the AC unit’s coils and fans. If the coils are dirty, they can cause the AC unit to make a squealing noise. The fans may also need to be cleaned or replaced if they are dirty.

What Causes A Car’s AC Compressor Clutch To Fail?

The compressor clutch is the thing that allows the air conditioning compressor to engage and disengage the engine. When it fails, the compressor can no longer pump refrigerant, which means your AC will no longer work.

There are a few reasons why a compressor clutch might fail. One is a loss of lubrication, which can happen if the compressor isn’t properly maintained. Another is a problem with the electrical system that controls the clutch. Finally, the clutch itself can simply wear out over time and must be replaced.

What Triggers Pulley and Bearing Damage in Car Air Conditioners?

Car air conditioners use a pulley and bearing system to compress and circulate refrigerant. Over time, this system can become damaged, causing the air conditioner to fail. The most common causes of pulley and bearing damage are lack of lubrication, overheating, and contamination.

a car engine exposed with the belts showing
some of the things used to make your cars AC unit works

What Are The Sign Of A Broken AC Belt?

There are several signs that your AC belt may be broken. The most obvious sign is if the belt is no longer turning the pulleys. If you can see the belt, inspect it for cracks or fraying. Another sign that the belt may be broken is if your AC unit is making a squealing noise. This noise is usually caused by the compressor trying to turn without the help of the belt. If your AC unit is not working properly, it could also be a sign that the belt is broken.

Does the serpentine belt affect the AC?

The serpentine belt is a very important part of the AC system, and this is the next possible cause of the squealing sound that we will take a look at. This belt helps to keep the compressor running smoothly and efficiently. without the serpentine belt, the AC system would not be able to function properly.

Why does my serpentine belt squeal when I turn my AC on?

Several reasons your serpentine belt may squeal when you turn on your AC. The most common reason is that the belt is loose and needs to be tightened. Another possibility is that the belt is old and cracked and needs to be replaced.

If the belt is loose, you can try tightening it yourself. First, locate the adjustment pulley near the AC compressor. Then, use a wrench to loosen the tensioner bolt. Next, use a ratchet to tighten the belt. Finally, retighten the tensioner bolt. You’ll need to replace the belt if it is old and cracked.

To do this, first, remove the old belt. Then, route the new belt around all the pulleys except for the AC compressor. Next, use a wrench to loosen the tensioner bolt. Then, route the new belt around the AC compressor pulley. Finally, use a ratchet to tighten the belt and retighten the tensioner bolt.

The serpentine belt does require some tools and a bit of mechanical skills, but here is a video that gives an example of the type of work and tools needed:

Issues that can cause squealing from your AC in your car

1. Air conditioner is squealing because the fan belt is worn out or misaligned.

The air conditioner may squeal because the fan belt is worn out or misaligned. Try checking and replacing the fan belt to see if that fixes the problem. If the problem persists, it may be necessary to take the air conditioner to a professional for further diagnosis and repair.

2. The condenser fan bearings are worn, causing an AC squealing noise.

The condenser fan bearings are worn, causing an AC squealing noise. In order to fix this, you will need to replace the bearings. This can be done by a professional, or if you are handy with tools, you can do it yourself. Replacing the bearings is not difficult, but it is important to ensure that you get the right size and type of bearing for your fan.

Other Common Air Conditioning Noises:

Other common air conditioning noises include clicking, hissing, and humming. Clicking may indicate that the unit is turning on or off, or it may just be a loose part. Hissing could be due to refrigerant escaping from the unit, which would be a serious problem. Humming may be caused by a fan that is not properly balanced. And to be honest there are even more causes for these other sounds, but we will get to those in another article, don’t worry.

dash of a car
Keep an eye on your dash to alert you to any possible issues


As you can see, there are a couple of main reasons why you might be getting these sounds coming from your AC system when you turn them on. And while some of them ( the serpentine belt) might be a bit more involved, you can also try to fix them on your own at home. There are a lot of Youtube videos that can allow you to follow along with their step-by-step guides and fix the issue at home.

With this issue, we suggest addressing it as soon as you start to hear any types of sounds that stand out from your car. The sooner you deal with the issue, the easier it will be to fix because there is a huge difference between a belt that is wearing out and a belt that snaps while in use. And that difference will usually be noticed on your mechanics bill to fix the issue.