Question about 1999 GMC Yukon

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When the ac is turned on a vibration/loud screeching noise comes from the area of the condensor. The vehicle runs fine when it is off, but has a shutter when the ac is on . Thinking maybe tensioner belts, or condensor. the vehicle is a 2003 yukon xl

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Just had this problem and it ended up being a $14 ac tensioner pulley. 2 bolts, easy to change out.

Posted on Aug 20, 2008

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The bold holding the compressor may have run slck or the belt needs changing.

Posted on Jul 21, 2008

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When I accelerate forward from a comp stop my car makes a loud grinding/screeching by the front driver side. Once running the noise stops but until it catches speed it makes the sound. What is that?


It could be several things, and I'm going to assume that the vehicle is front wheel drive.

First possibility is the constant velocity joint on the driver's side is worn out.

Second possibility is the wheel bearing on the driver's side.

As to the shaking at 70+mph, you may have an alignment problem, or some issues with the suspension components on that side of the car.

Does the noise get worse when accelerating from a stop, and turning, at the same time?

Apr 28, 2016 | Cars & Trucks

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Screeching noise


Your car needs alignment. The screaming noise comes from tires being dragged over aspnalt. This wears tires very fast.

Nov 18, 2013 | Cars & Trucks

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Noise is coming from the middle dash area, you can hear it inside the cab but engine area seems fine, no noise, this is driving me nuts, it sounds like a loud flapping or banging


Does this happen constantly or only when you have the cabin a/c or heater fan blowing? Do you hear it when the vehicle is running but not moving? I suspect that something fell down into one of the windshield defroster vents and is rattling around inside the blower fan cage.

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1 Answer

AC Clutch noise and vibration


An A/C clutch will not make this concern happen, more likely the A/C compressor is begining to go out. The belt on the A/C clutch Assy. free wheels (spins feree on the pulley) when clutch is not engaged. If concern is not present with A/C off this means the bearings in the puley assy. ok. Once the A/C clutch is engaged it locks the compressor against the spinning pulley and turn the compressor chaft and spins the A/C compressor internal shaft. If you hear a loud "screach" when you turn on the A/C it means the belt slipped for a second, if it continiues to screach it means either the belt is loose or that the compressor is internaly locking up. I wouild start by checking the belt tension (if not equipted with and auto tensioner). You can also remove the belt and turn on the A/C and attempt to turn the clutch/pulley by hand, it should turn with a little effect but should not bind or lock at times if that happens compressor is bad.

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1 Answer

I have a screeching noise when I start my air conditioning.


It could be but how easy was the belt tensioner ? that may be the problem by not putting enough tension on the belt. How tight is the belt ?

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May 19, 2012 | Cars & Trucks

1 Answer

There are 3 belts on the truck (1994 V6, 4wd). The belt that goes around the alternator was not spinning and there was a loud screeching noise. I cut the alternator belt to see what the truck would do with...


The pulleys may be out of alignment due to a bent or misinstalled alternator bracket. the alternator itself may be pulling so much current that the belt is slipping on its pulley. (might be why the other alternator failed. Check the battery voltage with everything turned off and see if you have a parasitic battery drain.) The bearing for the idler pulley (if equipped) could be failing.

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1 Answer

Loud Noise & Vibration


Who knows without inspecting it, but check the tires. Tires can cause serious problems even if they look ok. Though tires look fine, they can have an almost invisible way of vibrating a vehicle also un balanced tires can cause vibrations

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1 Answer

Vibration/Humming/Grinding noises when stopping or turning left.


when turning left vehicle distributes weight to right front wheel bearing causing load. since u describe a noise in right front while driving straight i would suspect failed right front wheel bearing. see if your noise changes/goes away while turning right that should tell u 4 sure

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