The Defrost went out, so now I have no heat. So the Automatic Climate Control (ACC) repair and restoration is now my top priority. I get started on it this weekend, when the temp will get down to 5° F tonight!
On the plus side, there is still residual heat coming from the dash, as the heating coils are still fed by the engine coolant. And the cabin is well ventilated, so the windows stop being fogged up after a few minutes of driving.
I have some wonderful help from my friends at W116.org. Their experience and knowledge is priceless.
I am also collecting documentation on this system. Mercedes-Benz Service Manuals are of course the best guides to start with, and the Climate Control Manual is available online here: http://handbook.w116.org/climate_78_3d.htm.
Right now I am in the learning phase, so
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