By "temp regulator" you mean the thing in the dash with the pushbuttons, the ACC? I ask because I'm not as familiar as I'd like to be with the ACC system in our cars. My unit had a bunch of fried traces and did not work completely. It came to me in that condition. I wired around the problems and resoldered everything (like the cruise control cure) and now everything works.

My guess would be a short somewhere, as Larry has already suggested. The ACC doesn't have many electronic things, mostly a bunch of small relays. Possibly one of them went pop. I would imagine that they control the monovalve, aux water pump, compressor, and blower motor. There is another controller behind the passenger side dash, or so I have read, plus a box of dropping resistors for the fan, on the passenger side inner fender. If you can open the thing up and figure out what went "pop," I may be able to help more with the diagnosis.

Jeremy

__________________

"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