1992 Toyota Corolla A/C screeches.

Hi there,

I feel that this is the A/C compressor belt, it may need re tensioning, get this looked at first.

Mark (mhpautos)

As Mark said, retension the belt. The AC runs on its own belt, driven by the crank pulley, up over a tensioner. The tensioner has an adjustment bolt, to the rear of alt. Looking down. Clockwise to tighten.
They would have to remove the AC belt to replace the timing belt.
You MUST loosen the AC idler pulley bolt to adjust tension, Don't remove, just loosen it a turn, then retighten after adjustment.

If belt was contaminated by coolant/oil, replace it and clean the pulleys with brake clean