the Control head for the fans can be a pain, I struggle with mine, you can find one at a pick n pull or salvage yard of your choice if you want to try and replace it. my suggestion about your heat issue is to change the thermostat. your car should get to 80*c in a decent amount of time, Also you may want to check your coolant level just to be sure.

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed