Is Belt worn, remove belt and check all devices turned by belt for noise or ruffnes when being turned, make sure belt tensioner is strong enough to tighten belt around all drive devices
This usually means the belt is loose or needs to be replaced. You can take it to a mechanic or your local auto parts place (auto parts places can usually look at it and tell you if it's loose or needs to be replaced). If there is a grinding sound with the squealing, you should take it to a mechanic (this usually means you have a pulley that is freezing up) if the pulley freezes to long, it will break your belt. Good Luck!
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: squealing noise coming from the belts while engine is running
take off your serp-belt and spin your water pump, alternator, idler pully and see what squeaks or feels rough. your water pump bearings may be bad. the only thing you can do is change it. dont forget to change your thermostat and antifreeze. FYI your antifreeze is made with lubricants in it for your water pump bearings.
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