Leathermang... I am using the service cd. but to be honest with you, the cd doesnt hold a candle to the factory chassis manual that I have.

I plan on getting a Hard MB hvac manual for our car but they a hard to find.

jbaj007...In my cd it says you can directly "hotwire" the clutch @ pin 5 and 7 of the compressor control module on the firewall so thats what I did.

Readings are @ 2000 RPM. The lowest I have seen the low side is about 15 PSI @ 3000 RPM.

I'm not sure about the RPM increase I'll check it and get back with you.

Maybe the comp. module is kicking the clucth out because the RPM is too high.

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87' 300sdl