You sure you don't have a refrigerant leak? My 84 300D was like that and it turned out to be low on refrigerant. Try shorting the pressure switch on the evaporator for a second.

This is of course assuming your compressor isn't coming on at all before you short the switch.

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'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.