Quote:
Originally Posted by duxthe1
Speed sensor will shut it off and keep it off until you cycle the key. It wont cycle it on and off. Too high pressure in the high side is the only thing I've seen cause a rapid on off cycling. Sometimes you can find a restriction in the high side by feeling for a cold spot in the lines and or looking for frost. A partial blockage can act like an expansion valve allowing the downstream side to get cold when it should be hot.
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Not to hijack this thread, but duxthe1 you just mentioned the problem on my 1990 W124. Whenever I switch the aircon the compressor engages and disengages about a second later. I can only engage it again after a key cycle. You say this is the speed sensor. I dont have that much experience with aircons, does it measure the speed of the compressor and where is it located roughly?