I am not familiar with the 201 but I looked at the wiring diagrams for your car and I see a unit called "Control unit for compressor protective cut-out". I couldn't find out where it is but I see that it has control of the compressor. It looks at pressure switches, temperature sensors, WOT switch, ECM, CCU, etc.
If you go the the stickies at the top of the Tech section you can find the manuals for this car. Go down to the climate control section. You can find locations, wiring, vacuum, trouble shooting and R&R.

PaulM

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84 500 SEL (307,xxx miles)