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#1
07-09-2004, 11:21 PM
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AC compressor disengaging
I have a 1987 300E with 120K miles on the clock. The car runs fine in every aspect except for the air conditioner. When I start the car and turn on the air the compressor engages and blows cold air. After about 15 to 20 minutes, the compressor dis-engages. If I restart the car everything is ok for another 20 minutes or so. Could this be an ignition switch problem. It is time for the belt tensioner and drive belt to be replaced. Could it be that the belt is slipping on the compressor? Any suggestions are appreciated.
Thanks in advance, Donwo
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Donwo 1999 SL 500 Sport (30K miles) 1998 E320 (SOLD) 1989 560SL (SOLD) 1987 300E (TOTALED) 1986 300E (SOLD) 1984 300SD (SOLD) 
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#2
07-09-2004, 11:53 PM
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Yes, the belt is slipping. Tighten it a bit if it looks to be in good condition. Replace it if not.
Don't forget to loosen the big 19mm bolt or you'll strip the threads on the adjuster.
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2012 E350 2006 Callaway SC560
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#3
07-10-2004, 12:38 AM
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I would bet that the a/c clutch coil is going bad.
It is electromagnetic. It could be getting hot and shutting down. Attach a test light to the clutch wires and see if the light stays on when the a/c quits woking.
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