2010 Chevrolet Equinox Q&A

2010 Chevrolet Equinox Question: How much will it cost to replace or repair the air compressor

The compressor is knocking when the engine is cold -
Answer 1
Does it knock with all heat/ac controls turned off when started cold?? If so it aint the compressor! Out of warranty? -
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It has stopped blowing cold air, had the freon replaced and that didn't help.