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1992 Toyota Corolla A/C screeches.

Tiny
BIG_SHEEPIE
  • MEMBER
  • 1992 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • MANUAL
  • 240,040 MILES
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Car has just been in for "service" and cam belts and alternator belts have been replaced by a Toyota garage.
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Wednesday, March 18th, 2009 AT 4:18 PM

2 Replies

Tiny
MHPAUTOS
  • 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)
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Wednesday, March 18th, 2009 AT 4:33 PM
Tiny
MMPRINCE4000
  • 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
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Thursday, March 19th, 2009 AT 5:50 AM

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