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Belt squeaks terribly. Eventually goes away after it gets warm. Replaced the belt, tried the tensioner, tried the alternator pulley. Still squeaks. Not sure if this is relevant but it used to go away when I turned the AC on. That no longer works. Also I don't know if this is relevant but the heat in my car doesn't work either. Any potential solution would be much appreciated it.
 

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One of the serpentine belts on my truck starts to squeak when the weather turns cold and damp. It only squeaks for about a minute during the first startup of the day, and then is quiet for the rest of the day.
I've tried replacing the belt, tensioner, pulley, etc. to no avail. I did find that the AC compressor pulley was a bit out of alignment, and aligning it properly seemed to help a little bit, but it still squeaks every winter.
I have just learned to live with it.
 
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