Help with dash temperature control
I have a 1996 HR Navigator. The rheostat temperature control pictured below is wired to the water valve" (also pictured below) and either one or both do not work. The rheostat turns smoothly from blue stop to red stop, but there is no corresponding action from the control motor above the valve. Can anyone tell me who the manufacturer of these controls is? I've looked at Evans Tempcon but don't see my controls in their catalog.
There are four wires leading into the valve motor and I'm not sure how to test the motor or the rheostat control.
I know most coach builders use commonly available items from car manufacturers and the like, but I haven't been able to identify these. I'd like to replace them with the same if possible, if not I'll try switching them out for something available in a local boneyard, or as a last resort, attach an aftermarket "choke" cable with a "PULL FOR HEAT" label thru the dash. Thanks for any help or insight.
on edit: Does anyone know exactly how the " Over the Road (OTR) " position is supposed to function? I asked Monaco techs and dealers, but never gotton a response that made sense. If it helps, there are two A/C compressors (one on top of the other) in the rear on the Cummins.