Question about 2001 GMC Yukon

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Belt tensioner vibrates severly only when a/c on

Belt tensioner vibrates severly only when a/c compressor engaged . is this an indication that compressor is binding?

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That is what it sounds like. Try to take off the belt and see how free the compressor turns.

Posted on Aug 02, 2009

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My 2000 alero makes a screeching sound when i turn on ac does anyone know what it could be?


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When stopped in drive the steering wheel vibrates a lot when the air conditioner is on .There are already new motor mounts replaced could it be the adjustment of the idle screw ?throttle plate cleaning...


The belt tensioner can cause many of these problems, sometimes the serpentine or fan belt is replaced, but the tensioner is not given much thought, a tensioner that is going out, can cause the belt to not have enough tension to keep the battery charged by slipping, when the clutch on the ac compressor cycles on and off, if the tensioner is to loose, or not tight enough can cause the compressor to vibrate, it can cause wear on other parts attached to the belt even cause pre-mature wear on other pulleys. good luck!

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I have a 1999 Grand Voyager. Whenever it rains, the serpentine belt comes off. What's the problem and solution?


Ok..that is a strange one.. I am going to hazard a guess and suggest you look to the AC compressor.

When you run the defroster the ac compressor comes on..typically whenever the outside temp is above 40 degrees.. the ac compressor kicks in to dry out air inside.

Often when it rains.. the windows fog.. you turn on the defrost.. the ac compressor tries to come on.. and.. there ya go.. rather there your serpentine belt goes.

Several things could cause this.. worn belt.. failing belt tension-er... or failing ac compressor..

If the ac compressor is frozen meaing it will not turn..when the electric clutch on the front engages.. it would cause the pulley to stop turning.. and the belt would have a hard time staying on a non rotating part.

Or if the belt tension-er is bad..or the belt is worn.. when the additional load of the compressor kicks in.. it jumps off.

Finally it could be a combination of all three..


Best of luck..

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Clicking sound you hear is the belt tensioner, due to a malfunctionig a/c compressor ,

the reed valves of the compressor are broken causing unstable pressure that makes the belt tensioner vibrate

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Your vibration damper may be going bad!
It sounds like a belt problem....but isnt load sensitive right? Yeah....that's what they sound like. Especially the part where they squeal on start up.

Have the tensioner replaced too just in case.

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This may be a stupid question, but has the tensioner for the belt been properly tightened?  Does it squeal when it vibrates?  The tensioner for the alternator belt is on top of the alternator and is a bolt you tighten or loosen.  The tensioner for the AC belt is underneath and can accessed with the right front splash guard removed and the car placed on ramps.

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