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.