Just replace the compressor. They get rattly sounding (even more than normal) after a while.
Mine (a 2004 GMQ) got noisy enough to drive me batty, so I bought a replacement from JC Whitney, which was identical to the OEM unit, and it came with new rubber mounting bushings. I think it cost me about $100... but I picked it up in person at the warehouse in LaSalle, IL.
It still worked perfectly (and quietly) when I traded the car a year ago.
Sig removed. Read the rules.
So, I read the rules. Now I'm even more confused.
My transportation sources:
1972 Green Schwinn Speedster; 1984 Canyon Red Mustang V-6; 2004 Gold Ash GMQ LS Ultimate Edition, (Traded away, sadly); 2004 Black Ranger XLT Flareside; 2019 Turd Brown Fusion Titanium Hybrid Energie.