Skip the auto shop - Our mechanics make house calls

Q: AC compressor squeals - 1991 GMC G2500

asked by on

The AC compressor on my van has been malfunctioning lately. It makes squealing sounds. When it's running, it is very loud. How can I fix this?

A: Hey there. With the engine off, see if you ...

Hey there. With the engine off, see if you can turn the AC compressor by hand all the way around. Look at the gap between the clutch and the pulley on the top and bottom to see it it is equal all the way around and the gap is less than .025 inches. Check to make sure belt is tight and belt is not oily or damaged. If the clutch is slipping due to problems it will show up with A/C gauges hooked up as a erratic gauge or excessive high pressures causing slippage. Your AC clutch or complete compressor may need to be replaced.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Wipers stop working at times - 1995 GMC G2500

Hello. This is caused by the wiper motor circuit board and cover. You should call a dealer to see if there is an active recall to repair this under a recall. If not, then I recommend replacing the entire motor...

Q: Speedometer not working when warm.

Due to the fact this condition is caused by both outside weather and engine temperature I am inclined to look at the vehicle speed sensor side of the circuit as interior cabin temperature is less effected especially by engine temperature....

Q: How do I tell if my power steering is going bad in my 2005 BMW x3?

Hi, thanks for writing in. Unfortunately, it sounds like your steering rack is done for, and needs to be replaced. This appears to be a wide-spread problem with this vehicle, without a recall or customer satisfaction program from BMW. If...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.