First, my friend was helping me tinker with my car, and he accidentally touched the two wires leading into the monovalve together. That shorted something, because now they're the exact same voltage all the time. Does anyone know what it would've shorted?

Second, does anyone know how the monovalve works? I know that there's an electromagnet in there, and the Benz manual says that when it's energized, the valve is closed. Now, when I looked at the monovalve when I took it out, in resting state it's short, but you can pull it out so that it's longer. What I'm guessing is that when the electromagnet is powered, it repels that top part, but I'm not sure that that's case.

What I'm trying to do is rig it so that the monovalve stays closed, so that the heat won't get mixed in with the cold a/c air.

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Gabriel
'91 350SD 162k
'83 300SD 210k - rear-ended and scrapped
'84 300SD 210k - totalled