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...
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Then there is possible low coolant which starves the heater core first due to it being at highest point in system. Always check when engine is cold and no pressure is present in lines. You may also have a mechanical inline heater valve in the hose going to the heater core that is not connected or stuck closed. That would be controlled by the dash heater lever and connected via a cable to the inline valve.
