clutches can be replced with compressor installed- I have done it. The bearing is
sometimes hard to find to purchase. I would assume the noise is the bearing. The bearing turns regardless if the AC is on or not. Held in with snap ring that holds the inner clutch face/ pulley to compressor. The outer clutch face is fastened to the shaft with small bolt. A pulley puller is usually needed to pull both parts of the clutch off.
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