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Being an electromagnetic clutch made of metal, the little pieces of rust that inherently fall off of metal objects in cars gets magnetized and hangs around in there. I'm not sure if it's the rust making the noise or if the rust keeps the clutch from fully retracting and that makes the noise, but when my car did it the sound would completely stop if the compressor clutch was engaged. If you spray some wd-40 in there (keep it off the drivebelt) it should quiet it down.
That worked for me anyway.
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