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  #1  
Old 09-03-2003, 02:17 AM
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Join Date: May 2000
Posts: 376
Noisy A/C compressor clutch.

My wife's 1987 190e has a noisy A/C compressor clutch. It sounds like worn brake pads when the wear indicators make contact with the rotors. This occurs after using the A/C and only makes the noise when the A/C clutch is disengaged. It's somewhat infrequent and can be made to stop if the A/C is engaged briefly.

I am assuming the A/C clutch is dragging and causing the noise. Is this a sign the clutch is about to fail? What to do? Drive it until it wears out the A/C clutch? Try to adjust??

Curious.

Tinker
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  #2  
Old 09-04-2003, 06:28 PM
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Join Date: Mar 2003
Location: Los Angeles, CA
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The first thing I check when I have a noisy AC compressor is the belt tension. On several cars I've worked on tightening the belt correctly got rid of the noise. I didn't believe it till I tried. In your case though I have doubts this is the problem because yours is noisy when it's off.

I believe your car has a serpentine belt so the belt tensioner should be checked. I believe the tension is set by aiming the pointer correctly and not by measuring the belt tension directly.

Check the AC idler pulley if you have one. I once had one go bad on me and replacing it got rid of the noise.

Someone else with more experience could probably tell you if the AC clutch is the most likely suspect but checking belt tension and AC idler is easy and cheap.
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  #3  
Old 09-04-2003, 06:33 PM
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In rereading your post I realised you've already identified the problem as the AC clutch and are asking how to deal with that. My response above is off the mark.

Someone else care to help?
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1982 300D Turbo
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  #4  
Old 09-04-2003, 09:07 PM
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Join Date: Feb 2002
Location: Seattle
Posts: 596
Mine did that and then gradually stopped. Quiet now. Not sure why. There are shims for it (washer rally, I think). And you can get a rebuilt from a dealer at a third of the cost of a new one (Tom Hanson at Caliber Motors). There is a special puller MB# 126 589 06 33 00 to get it off and you will need a pin wrench MB# 000 589 00 05 00 (though I think this is a relatively standard tool). The procedure with the compressor off the car says you can knock the pulley off with a plastic hammer, so you coudl probably do that even if it is on the car (but might not be very much fun). I would not let it languish if it is noisy. If it fails your serpentine belt fails and car becomes inop.
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1986 300E Anthracite + ECodes + MB Mileage Award
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