So my newly acquired 300D continues to work beautifully and I am done with the major important maintenance tasks and getting to some more items of personal comfort like seats and the climate control.

The PO just recently had the whole cliimate control unit replaced and the AC has been charged and serviced recently too. For some reason, the system just stopped working before I bought the car and I was told the heater works, or the AC works, but you can't have both at the same time. The PO said you had to throw some switch near the engine to choose whether you wanted heat or AC. Does anyone know what he was talking about and where this "switch" is?

Right now I think it must be on "Heat" because the AC compressor won't turn on when activated. However, I notice that not much heat can be made to come out of the panel either, although it has been fairly warm and maybe there is some temperature sensor that won't let heat come out if it is already above 80 or something.

Any help would be greatly appreciated as my FSM does not seem to explain this.

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Where there's a will there's a way
1978 300D

There is no such factory "switch" , but some PO may have put in something creative to bypass the evil climate control servo. I woould look around the servo for something.

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)

No switch??? I'll have to call the shop here that has always worked on it to ask if they did something exotic. The PO just paid the $1300 or whatever it was for that new climate thing, how fragile is this crap?? Luckily I live in a cool place. Might just remove the AC belt altogether to save .2 HP and just never use it. Suppose I risk the compressor going bad though...

Thanks for the heads up.

__________________
Where there's a will there's a way
1978 300D