Quote:
Originally posted by jivadent
Thank you, that's something to get me started. Can you clarify a couple of things? From what you said I'm getting that the monovalve needs 12V on one pin, and ground on the other for it to be closed (which would stop the coolant from going in, which would stop the heater core from blowing heat). Is that correct?
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You got it.
Out of curiosity, what were the ACC settings when the wires were crossed? If it was on 0, DEF or MIN, the temp controller should have been isolated.
It would seem the PBU is not sending a ground signal. The diagram suggests that it's handled by mechanical switches with a diode thrown in here and there. The monovalve is on the same fuse as the ACC so it can't be a bad fuse if the rest of the ACC works.
If you want to block coolant flow to the heater core while the weather's warm, fit a mechanical valve before the monovalve. A brass valve from Home Depot should work. Or you can run a switched ground wire to the monovalve. You want it switched or the monovalve will continue to draw from the battery when the car's parked.
Sixto
95 S420
87 300SDL