There is a plug that goes to the clutch. The clutch requires 12V to that plug to force the compressor to run. You will need to supply 12V to that plug manually in order to force it to cycle. I suggest running a fused line off the battery in order to do it.

Good luck,

Packman

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83 240D - 4 speed manual - Manilla Beige
189K miles, Tachometer mod, cool wooden shift knob from PeachParts, CocoMats, Original factory paint, manual windows, manual sunroof. Starting to add AudioWrap to this car too!