1992 Toyota Corolla A/C screeches.

1992 TOYOTA COROLLA

240,040 MILES • 4 CYL • FWD • MANUAL

BIG_SHEEPIE

MEMBER
1 POST

When i turn on the A/c it seems to be fine with idle speeds of about 800rpm, however as i increase the rev's the car makes a loud screech, when i turn the a/c off it doesnt make a screech.
This happens when the car is cold or hot, no difference what so ever.
Car has just been in for "service" and cam belts and alternator belts have been replaced by a Toyota garage.

Mar 18, 2009 at 4:18 PM

MHPAUTOS

✓ASE Certified Mechanic
31,937 POSTS

Hi there,

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

Mark (mhpautos)

Mar 18, 2009 at 4:33 PM

MMPRINCE4000

✓ASE Certified Mechanic
8,548 POSTS

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

Mar 19, 2009 at 5:50 AM

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