My apologies for the post, MBDOC provided me the procedure a few years ago, but I cannot find it.

At this point I suspect the speed sensor on the A/C compressor acting erratically and want to disable it.

This car DOES NOT have a Klima relay. And the A/C is controlled via the ECU.

Pressures are OK, if there was an issue with the pressures then the AC would not work fine for days at a time.

I also took out the CCU and resoldered most of the solder points.

Issue persists.

Car: 1994 E420

Symptoms: Nice cold A/C, then compressor disengages. Ambient air (HOT). This happens completely at Random, no restart necessary sometimes. I could be driving with cold AC (40F off the vents on a 95F day). It goes out, ambient hot air, keep driving normally, suddenly the AC starts working again. And no, it is not the temperature control valve allowing hot coolant, I checked for that too.

Pin 8 of DM:

Code 6: A/C electromagnetic clutch jammed or belt broken (I know this is not true)

Code 7: Belt Slips (no way, new belt and tensioner)

Conclusion: This freaking speed sensor must be acting up.

Potential Solution: Disable the sensor, and keep the AC running without it

I solved the ASR issues, and now this crap (random A/C)

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1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car
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