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it’s probably the pulley that is underneath it rather than the compressor , it could possibly be power steering pump , loosen off the ac belt tensioner take the belt off and see if it is quiet when you start it , the pulley is a cheap easy swap , if the tensioner pulley fails it can kill an engine as it can go through the cam cover and take the cam belt out , fingers crossed if it that and as above it’s an easy job to do