[Guy]

Wow, you guys have just helped me identify two more mystery switches on the dash panel. One is "rear heat" the other one is "compartment  heat". I am going to assume that one is the blower control for the newly discovered bedroom hot water heater and the other is the  pump for the dash, or as they call it "compartment heat" . I have not had time to activate these switches and see what the actually do yet.

I am still dealing with the  coolant loss that is coming from the general area of the front heater core, and dripping out  the genny bay at the end off the travel day.  I did find two shut off valves as you Gurus told me I would in the are of the engine mounted fuel filter, one about 10 inches above the frame rail, and the other just below the frame rail, both burried by  large hoses  to the oil filter, and a fuel filter mounted at the side area of the engine. Both valves look very sketchy. Not wanting to create a secondary problem while on the road, i left them alone and made a 300 mile trip to van Horn Texas today, losing about 3/4 gallon of coolant.

Am I correct that both valves on the engine block control water out of the engine, and the two other heater hoses I see going to the top of the radiator are the return? I had assumed that the two valves were output and return, but I don't think so...