Clamp off the rubber hose that comes from the engine to the heater core. Warm it up and see if that stops the warm air. If so, heater control valve is leaking hot water. Easy fix is to put a shutoff ballcock on heater line. Close it in the summer.
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2003 Newmar Kountry Star 3905, Freightliner XC chassis with CAT 330. Winnie the black lab, pretty Airbus captain wife, retired airline pilot with 11 grandkids. UH-1 pilot (Huey) U.S. Army 1967-1983. RVN 68-69. Northern Idaho my summer home.
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