It is possible to replace just the pulley/clucth assembly of the A/C compressor, but I am not sure that will solve your problem. I suspect the problem is the compressor itself that is damaged causing that noise. When the A/C is off, the pulley is supposed to free wheel, and when the A/C is turned on, pulley clutch engaged and alllows the compressor to run. If you heard the noise at that time, then mostly likely the compressor bearing is shot.
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Saturday, April 17th, 2010 AT 10:03 AM