Monovalve electrical question

[tinypanzer]

Hello.


Can anyone tell me under what conditions I should see 12v at the solenoid connection to the monovalve? I would assume that I would see it when the heat is turned on. What configuration of the CCU would you use if you wanted to verify 12V to the solenoid? This is a '90 300SE

Y'know, I think it's pretty ironic that MB uses vacuum in places where every other manufacturer would use a solenoid. In the one spot where every other manufacturer uses vacuum (heater valve) they chose to use a solenoid.

I am having heating issues and I think the CCU might be suspect. I just replaced the monovalve solenoid.


Thanks!


-tp