Quote:
Originally Posted by TX76513
Have you taken a look at your mono-valve?
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Good idea. The aux pump and the monovalve are usually on the same circuit. Both of them share a hot lead that has power any time the car is "ON." The aux pump has a normal ground (brown wire to chassis somewhere) but the monovalve's ground is sent through the CCU where it is modulated as needed to turn the flow of hot coolant off. If that hot lead is interrupted, the monovalve stays wide open all the time so you get nothing but heat out of the vents.
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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