A/C pulley making noise? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-09-2007, 09:24 PM   #1
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Default A/C pulley making noise?

Its a metal grinding sound. I know it'* the A/C cause it stops as soon as I turn the air on.
What could be causeing it? Do I need a new one or can it be greased?
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Old 05-09-2007, 09:46 PM   #2
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When my bearings were going it made the same type of sound...
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Old 05-09-2007, 09:50 PM   #3
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Moved 2. Please post mechanical problems in the mechanical section.
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Old 05-10-2007, 12:49 AM   #4
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I have the exact same problem. I was worried about it at first, but the air seems to work fine. ...though, I would like to know how to fix it.
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Old 05-10-2007, 12:53 AM   #5
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mine squealed and threw out some metal shavings. Had to replace it.
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Old 05-10-2007, 01:22 AM   #6
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If it'* a chattering metallic sound that goes away when the air is turned on i have been told it'* the gap between the clutches in the A/C compressor that needs to be adjusted. Mine does the same thing but once in awhile i get lucky and it goes away if i don't run the air and then i just won't use it for weeks to avoid the chatter.
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Old 05-10-2007, 03:15 AM   #7
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The clutch plate is pressed on the center compressor shaft and comes with a .020 air gap from the factory. When you turn the AC on the strong electric magnet pulls the clutch plate to the pulley thus turning the pistons in the compressor. So over time this air gap closes and the clutch plate starts to scrape when the AC is off. Sounds like all you need to do is increase your air gap a little (pull the clutch plate away from the pulley).
I have heard AutoZone rents or loans this tool out to adjust the air gap.

This is what the tool looks like and several companies sell similar versions.
http://www.sjdiscounttools.com/kdt3340.html

This link has pictures.
http://www.autoacforum.com/messagevi...threadid=15161
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Old 05-10-2007, 12:54 PM   #8
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You just made my day, thanks a lot!
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