Your car no more resembles the uS model than it does a 240D. The US only gets the fully optioned car including automatic A/C. Since your car didn't come with any A/C you will not find a wiring diagram for it.

You will have to diagnose it by function. Are you saying that you want to have the compressor cycle more (at a higher temp) or are you wanting to mix heat with A/C? This will probably have to be done manually.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician