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Likely just to be the A/C belt. It may need an adjustment or replacement. With key out of car just smear a little bit of grease (not much) on the belt. Start the vehicle & turn on A/C. If noise gone or quieter the belt is the problem.
It is your serpentine belt slipping on one of
the metal pulleys and the friction is causing the high pitch screech. The belt
may need to be tightened or replaced, which is an easy fix.
Misalignment of the belt, incorrect belt, worn or loose tensioner, Too tight of an adjustment (many service centers do this on purpose so when the belt breaks in it becomes properly adjusted, I do not believe in this philosophy), The belt is actually one long belt called a serpentine belt.....
If the belt is not tense enough it will squeal, so make sure it's tight enough. Otherwise you can use a stethoscope or long screwdriver up to your ear to isolate the source of the noise.
Your drive belt tension may be set too loose or the belt itself is going bad. If you have a spring loaded tensioner, that may have weakened as well. Bottom line is that when belt is not tight enough, the normal load from the compressor added to the extra load on the pump when turning causes the belt to slip (making noise) Eventually, it may begin making noise when started as the alternator demands more power in order to work (you likely have heard cars with this problem in parking lots...loud screech right after starting) Wish I remembered which method they use to restore tension on yours butyou can easily get that info in any inexpensive manual (they may even allow you just to browse it without buying)
One of the belt pulleys likely has a bad bearing. watch the pulleys for binding while it's running or remove the belt and check each pulley by hand. AC puts more strain on the belt...if the belt is not new and pulleys check out, (and tensioner is working properly) change the belt.
You have a Bad Belt Tensioner and will need a new one and Possibly a new Belt. Have the Alternator Checked also. It could have gone Bad during these Problems. If the Tensioner is Not keeping the Belt very Tight it will not allow the Alt. To charge the Battery and it will drain very fast.
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