Q: Car makes sqealing noise when AC is turned on

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Car makes loud sqealing noise when AC is turned on.

My car has 140000 miles.
My car has an automatic transmission.

Your car has what is called a serpentine belt which drives most of the major engine components, one of which is your A/C compressor. When this belt is worn or loose, it will create a very loud screeching sound as you describe. This is often times a relatively simple fix when equipped with the right tools. I would recommend having an expert, such as one from YourMechanic come to your home or office to diagnose and repair the squealing noise.

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