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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I also recommend you check the heater core valve. It's under the hood and is run by 12v or in some cases vacuum. It will be right inline in the heater core inlet hose. Most likely its not opening correctly. Very common issue.
