Why is the compressor making a Loud noise?

Hello, the compressor will make a loud "clunk" on initial engagement, but after that, should not really make any appreciable sound. Certainly a little, but not that much. If the compressor makes grinding noises, have it checked for a possible bearing concern. Alternatively, one of your pulleys - like the idler or tensioner pulley - could be noisy and make more noise when the load of the compressor is on it. www.repairpal.com/repair-shops