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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Also check the coolant control valve that most likely on the outside of the firewall from the heater core. I think others have had problems with this valve not opening or closing.
