hmm... Mine doesn't do it. It has only done it a few times, then I sprayed wd-40 and no more squeal...

 

it could be the pulleys , but most likely it is from using crappy aftermarket belts , go get a set of oems and see if that fixes it... or maybe try the more expensive aftermarkets like gatorback ect... also maybe your a/c compressor is getting old/tired you could try replacing the whole compressor or the clutch on the compressor....

 

Bearing wheel on the alternator was shot and replaced the thing no more squeal.