We have an AN340. After looking through all the manuals we haven't figured out what is probably a simple thing. How do you turn on the coolant to the interior heating radiators and how do you turn on the electric fans on them? Even with the climate control on there isn't any hot coolant coming up to the underseat radiators and defrost unit. The fans to the underseat units don't come on automatically either. We get heat from the rear ducts. Any ideas? Don and Cary
On the drivers side, rear door, into the radiator section, on the left side (toward the front of the bus) there is a plywood door that removes to access the pump, terminal blocks, and some valves for the bus heat.
I removed all of this from mine and completely rearranged the plumbing in the rear. It came out when I removed the A/C system.
Do you have a schematic/isometric of your heating system?
I do if you need them.
Ed