Re: Squealing belt issue
As John suggests, a photo would help. Most A/C setups require the belt wrap around a good portion of the A/C compressor pulley to eliminate slip there. Is your belt wrapping around the A/C pulley or is the belt for the A/C compressor pulley just touching a small portion of the side of the pulley? You can run a water pump with minimal belt contact, but not a heavy load A/C compressor.
'69 Z/28, Lemans Blue/White Stripes, DZ302, Tremec Magnum, 4.10, Procar Elite Seats,
Custom Upholstery, Dynatech headers, 17" VWW V45's, 235/45, 275/40, C5 Front Brakes