Car making a loud squealing noise when Ac is turned on
you need a new belt driving the compressor- when you switch the AC on it activates (puts load) on the compressor and the belt- check all the belts while you're at it-
and the tensioner...just to add to jam's excellent answer. You don't say what even the car is..a serpentine belt with a spring-loaded tensioner..or a V-Belt? Either case jam is still spot-on
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