What is this squealing noise when ac is turned on?

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Introduction to the sounds that can come from your cars AC unit.

A/C units are a common source of issues for anyone with a car, which makes sense because AC is a very important thing to have in your car. In some places, you won’t last very long in a car without AC because it is just too hot outside. No one wants to turn into a sweaty puddle in your car from a 15-minute drive. Add in a leather interior that just isn’t be an enjoyable ride.

There can be a bunch of problems related to the compressor in your car but for this article, we are going to look ( or listen to the more annoying one), which is when you hear a squealing or screeching sound when your AC is turned on.

What is this squealing noise?

If your central air conditioner makes a squealing noise when you turn it on, there could be several causes. The most common cause is a failing compressor. The compressor is the heart of your AC unit and circulates the refrigerant through the system. If the compressor is failing, it may make a squealing noise as it tries to start up. Another possibility is that the blower motor or fan belt is loose or worn out. This can also create a squealing noise as the parts try to spin.

Here is a great video that shows what the sounds that could be coming from your engine/ac unit:

sqealing ac unit

Causes: List some potential causes of the noise.

There are many potential causes for a squealing noise when the AC is turned on. One possibility is that the AC compressor is failing. The compressor is responsible for circulating the refrigerant throughout the AC system. If it fails, the refrigerant will not be circulated properly, and the AC will not work properly.

Another possibility is that the condenser’s belt is dirty or blocked. If it is dirty or blocked, the refrigerant will not be cooled properly, and the AC will not work properly.

Finally, there could be a problem with the AC evaporator. The evaporator is responsible for absorbing heat from the air inside the vehicle. If there is a problem with the evaporator, it will not be able to absorb enough heat, and the AC will not work properly.

Troubleshooting: Offer some tips for troubleshooting the noise.

If your cars air conditioner is making a squealing noise, there are a few potential causes and solutions. First, check to see if the noise is coming from the outdoor unit. If so, it could be that the fan blades are hitting something. Loosen the screws holding the fan blades in place and adjust them so they’re not touching anything.

If the noise is coming from the indoor unit, it could be that the blower wheel is loose. Tighten the set screw on the blower wheel to see if that solves the problem. If not, you may need to replace the blower wheel.

Finally, if neither of those solutions works, it’s possible that there’s something wrong with your compressor. You’ll need to call a professional to take a look at it and diagnose the problem.


If you have read over this article and haven’t really found what you are looking for don’t worry as it was just a brief article about the very tip of the iceberg when it comes to what could be causing the annoying sound that is coming from your cars AC unit when you turn it on.

We got a couple of messages about this issue, so we put together a far more throughout walkthrough that will explain a lot more about the other causes, some of the fixes you can do at home, and what you can do to avoid this irritation in the future.