I'm sure this has been covered before, but I couldn't find it.

Problem is: The only way I can get the 'EC' to come on is if I first turn on one of the other buttons, let it run for 10 seconds or so and switchto 'EC'.

Tonight I did the 'Defrost" then the change to 'EC' and drove home (1 hour) and went through all the temps and it worked fine. "Auto' even worked fine.

Whenever I turn off the car, I need to do the 'Defrost' to 'EC' thing again.

Changed the Monovalve tonight before the drive so at least I have heat.

Any Ideas?

__________________
1994 E420, Pearl Black/Black. 2.82 rear diff., AMG front spoiler, painted lower half. SOLD

1972 & 1974 BMW 2002tii's.

Sorry, the problem is with the 1985 300CD.

Craig

__________________
1994 E420, Pearl Black/Black. 2.82 rear diff., AMG front spoiler, painted lower half. SOLD

1972 & 1974 BMW 2002tii's.

My 84 SD is doing the same thing, except mine is more finnicky. There are times I can't get it to come on at all. I suspect the control unit (pushbuttons) but I just might clean all the electrical contacts in my fusebox before I have my mechanic try to troubleshoot anything...

__________________
Bob Roe
Lehigh Valley PA USA
1973 Olds 88, 1972 MB 280SE, 1978 Datsun 280Z, 1971 Ford T-Bird, 1972 Olds 88, 1983 Nissan Sentra, 1985 Sentra, 1973 230.6, 1990 Acura Integra, 1991 Volvo 940GLE wagon, 1983 300SD, 1984 300SD, 1995 Subaru Legacy L wagon, 2002 Mountaineer, 1991 300TE wagon, 2008 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon, all gone... currently
2007 Honda Odyssey Touring, 2014 E350 4matic