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when the a/c or the defogger is on a squealing noise comes from under the hood. could it be the a/c clutch or the belt tensionner?
It could be both, but it sounds like your A/C compressor has seen better days and needs to be replaced, Here is our estimator guide for pricing in your area. http://repairpal.com/estimator?car_type_id=1710
Q&A > Plymouth > 1997 Plymouth Voyager