I'll be the first to state/ask to obvious. Your car has Type III climate control.

Which button do you have pushed? Does the compressor engage? Have you 4resoldered the climate control unit? A siezed aux water pump will toast the climate control unit. Has the one amp fuse mod been done to save the climate control unit?

There is a lot of information regarding this version of climate control. Tell us what you have checked/tested.

__________________
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'82 240D Stick
'85 300D Auto
Drove my first MB at age 16 1960 300SL W190