If, when you remove the serpentine belt, you rotate the A/C compressor pulley and it sounds like a bunch of sand trapped in grease in a rotating assembly, you have a bad A/C clutch ass'y. I still am yet to make this repair after letting it sit for a year, and I have not experienced any real negative effects. Price for a complete reman A/C clutch w/pulley for my 00 GT was about 40-50 USD.
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WizAire CAI w/9" K&N & HV3, 2.5" d/p w/h/f cat, Cobra CB, PowerSlot slots w/Hawk HPS, GR-2s, GMPP handling kit, NextLevel STBs, Pilot Sport A/S Plus tires.
98 L36/MM5
RaC