I have a 1985 300 TD and I have been trying to resolve some vacuum issues. The other day I disconnected the yellow lock hoses and plugged the end of the supply to them. While doing this I seem to have pulled out the line to the Engine shut down. I drove the car for the day using the manual shut off under the hood. When I reconnected the hose to the shut off, not only does the shut off still not work but the heater has now started to blow only super hot air.

Does this car have a vacuum driven blend box? If so what color is the line?

Or is this a Climate Control console issue?

Please help, I may be in MN but I won't need that kind of heat for about a month.

yep, it is all controled by vacuum. Now finding out whether it is the actuator or the valve in the control itself, or a line in between is going to be the pain in the ase.

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2003 Dodge Ram 2500 Cummins - Georend fully built trans, Banks Big Hoss Bundle, Smarty Tuner, 5" turbo back exhaust. 500 HP and 1100 ft/lbs to the ground.
1979 Mercedes-Benz 300CD - Lost to a four car pile up on 275, Thank You Michigan Drivers.
1986 Mercedes-Benz 300D - Sold, Euro non-turbo car.

The heater valve is electrically controlled. It will open if it looses power. I would start by checking the electrical connector on the monovalve.

I agree, it is not a vacuum issue, check the connection on the monovalve and make sure the fuse (#8, I think) is in good shape with a solid connection. Mine will start blowing hot if I have a weak electrical connection (apparently not enough voltage to the monovalve?).