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AC Compressor clutch bearing

rap169

By rap169
in Ask A GM Technician

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rap169 Enthusiast

rap169

Posted
Posted

Please help me. I have a 2003 trailblazer that is making a whining sound from the ac compressor clutch. When the pully is free wheeling its loud whine. When the clutch is engaged, the whine is still there but alot quieter. It gets louder with engine rpms. Now my question is is it the clutch or the bearing? And can it be changed with loosing my charge on the AC system?

bobcat5544 Enthusiast

bobcat5544

Posted
Posted

Are you sure it is the ac compressor and not the cooling fan clutch or water pump. It's odd for the compressor to have a squeal noise when it is not engaged and then get quieter when engaged.

rap169 Enthusiast

rap169

Posted
  • Author
Posted

i am almost possitive its from the ac compressor. You can watch the compressor kick in and out and the niose changes when it does.

bobcat5544 Enthusiast

bobcat5544

Posted
Posted

With a bad water pump bearing or fan clutch when to ac compressor kicks on will put more resistance in the belt system which will change a noise on a bad water pump bearing or fan clutch.

 

I'm not there hear what you are hearing so it makes it hard foe me to diagnose, I just don't want you to replace a compressor unless it is for sure, because you can't replace the bearings on it.

 

The average cost on this job at a shop is about $1400 (note this is with them raping you with extra things you don't really need and charging you for the cost of Freon when they stole it out of your truck to begin with)

 

Do it yourself about $500-$800 that is with you taking the truck to a shop to have the Freon removed and put back in and with out replacing the orifice and accumulator which when you by the compressor the parts store will tell you. You have to replace them or they will not warranty the compressor. This is illegal under federal law.

 

So just make sure. You can remove the belt and spin all the pullys to see if any of them make noise. Also check the idler pully, tensioner pully, and water pump pully make sure they are smoth no bubber build up also try replaceing the belt it sounds odd, but the belt on these trucks can make a god-awful sounds when they are worn or there is rubber build up on the pullys

 

If you have any questions let me know.

rap169 Enthusiast

rap169

Posted
  • Author
Posted
With a bad water pump bearing or fan clutch when to ac compressor kicks on will put more resistance in the belt system which will change a noise on a bad water pump bearing or fan clutch.

 

I'm not there hear what you are hearing so it makes it hard foe me to diagnose, I just don't want you to replace a compressor unless it is for sure, because you can't replace the bearings on it.

 

The average cost on this job at a shop is about $1400 (note this is with them raping you with extra things you don't really need and charging you for the cost of Freon when they stole it out of your truck to begin with)

 

Do it yourself about $500-$800 that is with you taking the truck to a shop to have the Freon removed and put back in and with out replacing the orifice and accumulator which when you by the compressor the parts store will tell you. You have to replace them or they will not warranty the compressor. This is illegal under federal law.

 

So just make sure. You can remove the belt and spin all the pullys to see if any of them make noise. Also check the idler pully, tensioner pully, and water pump pully make sure they are smoth no bubber build up also try replaceing the belt it sounds odd, but the belt on these trucks can make a god-awful sounds when they are worn or there is rubber build up on the pullys

 

If you have any questions let me know.

 

I agree with what your saying. I was also thinking the same thing last night that maybe the noise gets quieter because of the extra drage when the compressor engages. Im gonna try the idler pully and gtensioner pully first thing. They are cheap and usually wear out on every gm ive ever owned. So ill start there. Thanks for your suggestions.

rap169 Enthusiast

rap169

Posted
  • Author
Posted

well i changed the idler pully tensioner pully and belt. Still makes that loud whining sound. So i removed the belt and turned the compressor by hand. It def makes a weird sound. Like a wooooo sound. I dont think it should do that. is it the clutch or bearing.

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