Dash heat only blows cool air
I just bought a 1998 Newmar Mountain Aire with a Chevy 454. I turned on the dash heat, and it blows cool air. The air conditioning works great. The blower also works fine. Just no dash heat. Engi...
Forum Discussion
Vacuum valve in heater hose is to stop coolant flow to heater when in Max Cool mode. It gets vacuum only then. Heat temp is controlled by coolant flow valve regulated by a cable to lever on dash control or by an air mixing door in heater plenum and also controlled by a cable unless vehicle has autotemp system. 165deg engine temp is too cool. You need at least a 180 deg or preferably a 192 deg thermostat.
