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Old 06-23-2000, 01:08 PM
Posts: n/a

I don't think crank speed is an issue with these cars. I understand that this appeared with the W124 because it has a serpentine belt, and a compressor failure
can break the engine! So those compressors have a built-in speed sensor, and if the
crank speed and the compressor speed are too far apart, the compressor is disconnected.
Unfortunately, the speed sensor makes those particular compressors Mercedes-specific, and therefore pricy.

Update: I have successfully charged the refrigerant circuit with R134a. With a clip lead to the compressor clutch, I get cold air out the ducts. Yay! But the control system still won't turn it on without help from the clip lead .

I've half a mind to scan this climate control schematic into a GIF and post it on my website, so I can show people just what I have to work with....

- Jerry Kaidor ( )
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