Ok, this is my first mercedes, and I am a bit baffled. My a/c and heat have issues, and eventually im going to have to put a valve on my coolant line for heat comming into the cabin. But right now i cant get my a/c compressor to engage. The system has a charge, and has held one for over a month... I have power coming from my switch on the dash, but no power going to the a/c compressor. And info on what relays or ampilphiers to look for would be great. I am having problems simmiliar to this except that my compressor isnt working a/c blows nothing but hot air, 1980 300sd

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