Puzzling Discovery - AC Noise
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Puzzling Discovery - AC Noise - 4/25/2008 3:05:51 PM
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millejdq
Posts: 48
Joined: 1/4/2007
From: Northfield, MN
Status: offline
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All,
I'm trying to determine the source of a puzzling noise coming from under the hood of my D2.
Here's the scenario and the background info: 2002 D2 with 33k miles on it (non-ACE). Just replaced the serpentine belt, it was so old and cracked that two rows of it let go shredding about halfway around the length of the belt. I knew this had to be replaced and had ordered a replacement from RoversNorth, but it let go before I had a chance to replace it. I did not order idler pulleys and a tensioner because I hoped they were still ok.
Since replacing it I have the following issues:
1) Belt squeels a bit when I accelerate, so I figure I'm not going to get away w/o replacing the two idler pulleys and the tensioner. Old belt did not squeel, it just got a bit noisy (signaling time for a new one), and finally part of it just let go.
2) Now here's what has me puzzled: I get a knocking sound that seems to be coming from the AC Compressor. I can feel it when I put my hand on the compressor, but not on other accessories. The noise pretty much disappears when the AC clutch is engaged. The noise is the worst when things are cold and gradually goes away, but IT IS LOUD when the engine is cold. Sounds like a TUNK.....Tunk......Tunk...............TUNK......Tunk.......tunk (yeah I know, real scientific).
Any Thoughts greatly appreciated.
JeffQ
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44.46N -93.14W
2002 Discovery 2 SE
2002 Volvo XC70
1973 Maserati Indy
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