I have been having a sort of rattling sound from the engine compartment and last night I tracked it down. The AC compressor turns intemittently when the engine is running but the AC is OFF hense causing the metallic rattling sound. If I turn the A/C ON then the noise stops. Does anyone know if this is a bad clutch and can be replaced or does the whole compressor need to be swapped? Can the fix be done with the compressor on the car or do I need to take it out if I can just do the clutch?

Is that what you're experiencing? I think I've had it AC on and off, but it's usually after I rev the engine.