Do yourself a favor. Don't spend a dime on the clutch to try and repair it. Been there, done that. You must find an A/C specialty shop that deals in genuine replacement A/C parts for GM. They are out there. Just bite the bullet and let the pro's go through the whole system. They'll retrieve the coolant. Top off the oil in the new pump unit. Check the small filter for metal debris in the tank, (that's another story). They'll replace the old rubber o-rings with new ones..... And on and on. It's something a professional should do.
The guy handed me my old compressor pump and a fresh Delco one out of a box. He told me to spin both. The internal pump was shot! I would have wasted $$ on the clutch doing it myself. It wasn't the clutch. The seal behind the clutch?.....it was leaking oil out of the pump. I didn't even suspect the pump because here I thought it was the clutch making all that noise. When the system ran and warmed up, the noise became louder.
I got the car back, and now I have to crack the window open, just to warm up a little. Needless to say, it was well worth the (parts&labor) $500 plus rebuild.
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