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2005 chevy trailblazer_ls
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2 Posts
Discussion Starter #1
Hi all,

Quick diagnosis question. My '06 Trailblazer (4.2L, 90K miles) has had a whine from the engine and recently started developing an intermittent chirp and other strange fluttering and scraping noises.

Tonight, I removed the serpentine belt and spun some of the pulleys. Idler was silent, as was the alternator. When I spun the a/c compressor, however, there was quite a bit of noise.

Additionally, when the A/C is on, there's a definite additional whine that isn't present when turned off. The A/C, however, is cooling perfectly.

My gut says that this is the A/C clutch, which can be replaced independently of the compressor, since I can hear the noise while free spinning the pulley. However, given that the noise gets louder with the A/C on, I want to make sure that this doesn't seem to suggest that the compressor is also at fault.

Thoughts?

Thanks.

Justin
 

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2004 chevy trailblazer_ls_ext
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58 Posts
It could be the belt tensioner pulley but my money is on the AC clutch bearing. I have an '04 and just replaced mine a month ago. Do a search and you will find a complete write-up. You have a different year model and I don't know if that matters but I got my bearing from Auto Zone. The part number was MT2031.

Found the write-up....http://forums.trailvoy.com/showthread.php?t=53918&highlight=clutch+bearing
 

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2002 chevy trailblazer_lt_ext
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249 Posts
I kinda forget how ours sounded when the bearing failed? I checked on a new compressor, think it was like $500.00! I found this fix and had a local bearings dealer get me one for like $15-$20.00. worked like a charm but does take some time & patience. The bearing # was 35BG05S7G 01 2DST. Here is the thread on the repair if needed, http://forums.trailvoy.com/showthread.php?t=53918
 
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