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I've removed the bus heat and this is just above the large heater core for the passenger compartment.  It connects to the line going to the heater core.  Is this a valve or a pump?

I that a rather large solenoid on top.

Also, hard to see in the picture, but there is something with air lines just behind it.  What is that?

Thanks for all the input... today is my day for questions.

Dave

I can hardly see the picture but it looks like a valve.  Ford puts a valve with similar functions in their trucks.  It stops the flow of hot water into the vehicle unless you open the valve.  Somebody might have a better guess though.

I am pretty sure it is the heat supply valve for the OTR heater system.  It is an electrical on/off valve, normally open with no current.  The bus system has a way of telling it to open and close to regulate air temp inside the bus that I have never been able to figure out.

Brian

That's starting to make sense.  There is a digital water temperature readout on the dash with a dial control.  If you use some patients and moderation you can do a good job of controlling the coach temperature by adjusting that dial. 

That dial must adjust this valve and allow variable amounts of hot water through the heater core. 

Well, I don't have the heater core anymore, so I don't need the digital readout, so in theory I don't need this valve.  However, I do need some control valves to switch between engine heat and propane heat up to the driver heaters and to heat the engine with the propane heater.

I'll give it some thought.

Any ideas about the air valve behind?  Should I take a better picture?

Dave

FWIW it's an on/off valve, not a continuously variable valve.  It uses the heatsink of hot water in the heater core to smooth out the heat delivery to the bus.

Brian

Florida! ;)