Quote Originally Posted by truk4u View Post
Dust Man,

Put your year in the signature so we know your vintage. I still stand by my original comment it's the solenoid valve for the house heat exchanger loop, but is it possible someone along the way wired it to run on the engine heater solenoid?
Very open for this possibility, but if that is the case, why does the living area get heat in the condition that the webasto block heat is included in the picture? This is not to say that you are incorrect. I'm just looking at all the evidence.

Thanks for your input. If you have any bright ideas in the mean time, please share!

Adam