I have a 1996 Overland Osprey Class A on a Spartan Chassis. It has the Evans Tempcon dash control unit RV218416
and the D32H-19A706-AB resistor.
These parts are very common. The control unit is a Chrysler product Slide Action Control Panel for Dash Heater A/C Mopar part no 55036774 and the resistor is also very common.
I have been battling my dash heat/AC fan on high speed. While driving with the fan on high it will run fine for few minutes and then stop. A couple minutes later it will come back on. Also discovered while driving at night that the light on the control unit goes off also when the fan shuts off. It works fine on the other 3 speeds (doesn't stop). I know high speed takes more amps. I have not found a separate relay for it.
I have changed the fan switch on the controller and the resistor on the fan duct box. No change.
Also when the I turn on the fan on dash the fan on the A/C radiator turns on. I notice that the wiring for the relay for that fan was getting hot and looked burnt. I replaced the relay and the wiring that was burnt and it isn't get hot any more.
The wiring harness on the resistor looks good - doesn't look burnt or lose connectors.
I am stumped as to what else to do. Any idea?