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08 TrailblazerSS AWD
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Sounds like a pulley or possibly bad water pump bearing. Does it change sound at higher rpm?
 

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'07 3SS 2WD
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533 Posts
Pull the belts off and spin each pulley individually.
 
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I took the serpentine belt off and the ac belt. noise stopped and I figured out the noise was coming from the AC clutch. Anyone know the part number for an AC clutch?
Rockauto may sell it alone and I know I’ve seen folks replace just that. Of course special tools are involved. Or you buy a whole new compressor…. But have to recharge your system
 

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Discussion Starter · #9 ·
Rockauto may sell it alone and I know I’ve seen folks replace just that. Of course special tools are involved. Or you buy a whole new compressor…. But have to recharge your system
Yeah seems like changing the whole compressor is the way to go, i’ve been having ac problems in the past so hopefully this will fix that too.
 
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