I have a 1995 300D that I purchased over a year ago. Overall it has been a good car but when it rains my a/c doesn't work (windows fog over and very dangerous to drive). I have taken it to my MB mechanic and he said there is a clutch that won't engage to keep the compressor from burning out when it gets wet. He said all I can do is stop the car, remove the key, restart it and see if it will come back on. That hasn't worked. Has anyone else encountered this problem? Solutions/suggestions?

I have a hard time thinking there isn't some way to fix this. This issue is keeping me from using it as a daily driver. MB couldn't have designed a $40K car to not have a/c in the rain. Your comments are appreciated.

Check your serpentine belt , if its slipping the compressor will disengage

The speed sensor sounds like a likely suspect, due to belt slippage. Usually turning off the engine (parked) and restarting works, though.

Some info here from a real pro: http://www.continentalimports.com/ser_ic60046.html

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

My 91 300E used to do this, when I first got it. Only happened in the rain. Would usually happen when transmission downshifted. It was cured when I properly tightened the belt tensioner to the correct tension. Didn't need to change any parts - just adjust properly.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

I appreciate the feedback and suggestions. I know my MB mechanic checked the belt and tightened it previously. I will follow up on it and see if it is set to the right tension.