It depends on if the compressor clutch is causing the noise or if the belt is slipping. The spring loaded tensioner could be getting weak and not keeping the belt tight.
SOURCE: squealing NOISE possibly from fan belt
There are several things you should know;
1. Power steering belt, when you make a turn, sometimes make noise, because your car needs power steering oil,=transmission oil.
2. when you turn on AC then you can hear a loud noise, you must check AC compasser,If the head wheel frozen, it will make a lot noise, that you have to fix your AC compasser.
3.check these two first, if both ok. shot some wd40 or lubricate see if it's work.
Hope this can help you
SOURCE: loud squealing noise
The noise is most likely the serpentine belt. Check it's condition and that of the belt tensioner. It sounds like the belt is slipping, causing the squealing noise u describe. As the belt warms up, it's getting a better 'grip' and the noise stops. Turning on the heat also turns on the a/c in newer cars, this added drag on the belt (one more component to turn, the a/c compressor) would explain why it happens when u turn on the heat. Is the belt original? If yes, it's time to change it, and check the belt tensioner to make sure it's doing it's job of keeping the belt snug on all the pulleys. Let me know how u make out.
SOURCE: Squealing noise
After your vehicle heats up, spray your belt with water. If it squeels, it's a belt. If not, it'll be a tensioner or pulley.
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