Question about 2002 Chevrolet TrailBlazer

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A/C compressor clutch slipping in my 02 trailblazer

I recently replaced the A/C pulley bearing due to a growling noise. the pulley is quiet now but when the clutch engages it slips. there was only 1 spacer between the clutch and pulley when i removed it so i reinstalled that one spacer. i did nothing to the magnetic coil and was extra careful not to pry on or bump it. i also tried installing the clutch without the 1 spacer but it rubs when the compressor is off. not sure what else to do and cant seem to find replacement parts if theyre needed. the compressor its self is in great shape and was working fine before i pulled that pulley off. also i tested the circuit for the coil and the coil its self and im getting normal operating voltage when engaged and am reading about 4 ohms on the coil. is there anything else i can do to possibly make the clutch engage fully maybe something that will increase the friction between the clutch and pulley?

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  • Chevrolet Master
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When the A/C clutch is not engaged is the space between the pulley and the clutch plate with in specs?

Posted on Mar 29, 2018

Testimonial: "A .025" shim is the largest that will fit the air gap on my compressor. specs on this compressor call for anywhere from .020"-.030" so it is within specs. without the single spacer none of my shims will fit and the clutch constantly rubs and gets hot but still doesnt produce enough friction to fully engage the clutch."


6 Suggested Answers

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Posted on Jan 02, 2017

  • 962 Answers

SOURCE: 1998 Dodge dakota 4 cyl. manual trans.

You may want to try adjusting the clutch. I think Dodge have adjustment options. it seems that the throw out bearing is too close to the clutch and does not "throw out' as it should.

Posted on Oct 29, 2008

michigan man
  • 3533 Answers

SOURCE: 1998 outback lmtd - clutch replacement

you check at your local library for a price guide to let you know how long the job should take and then you can call local repair shops to ask how much they charge per hour for the job

Posted on Mar 08, 2009

  • 95 Answers

SOURCE: The AC on my 97 Ford Taurus only works sometimes.

There is too much air gap between the hub and pulley. Usually, there are shims under the hub to set the proper gap. If you remove the small bolt in the center of the hub, it should slide off. There should be shims that look like small washers on the compressor shaft. You may need a magnet to get them out while the unit is on the vehicle. There are different sizes available and you have to remove smaller ones to reduce the air gap. These shims usually come with a new clutch, but a dealer or parts store should be able to come up with just the shims. I just searched Google shopping and found shims available for $13-$14. You need to find a combination of them that is a few thousandths of an inch thinner than what is in there right now. A new clutch looks to be around $80-$90. I hope this helps. Good luck.

Posted on Aug 16, 2009

  • 8 Answers

SOURCE: I have a 91 dodge colt that the ac clutch is not engaging.

if the freon pressure is too high or too low there are two seperate pressure sensors that will disable the a/c clutch to prevent dammage to the compressor. You need to check (or have it checked, dangerous if you do not know how) the pressure on the high and low ports while you have you jumper wire in place and the a/c is running. PLEASE RATE MY solution as I am new on here, Thanks

Posted on Aug 26, 2009

  • 1239 Answers

SOURCE: 02 envoy, 6 cyl, loud wooshing noise when engine

Fan clutches for Envoys and Trailblazer are a problem, they go out all the time.

However, it is normal for it to do this when cold, but will only stay engaged for maybe 15 seconds AFTER you've put it in gear and have started to drive. After this, it will disengage and allow the engine to warm up faster.

If you haven't already replaced the fan clutch once, you're lucky. 2002 is especially bad for the clutches, but all years don't last long. Mine lasted 90k which is pretty long.

Posted on Mar 01, 2011

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Yes there is a bearing in the AC clutch assembly, and the bearing can be changed with out swapping out for a whole new AC compressor unit or even taking the unit out. 
The other thing to you may want to check is the Serpentine belt tensioner. The tensioner then to break apart and or when the clutch activate put's more pressure on the system and the idler pully bearing could alsy be the problem. 
Spray some water on the fan belt whale the engine is running and see if the noise goes away and comes back as the water dry's. If the noise goes away then it's just a worn belt and need to be changed or you may want to do the quick fix and buy Fan belt dressing. 
Good luck and hope this helps

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