On my coach, Evans is the manufacturer of the heater and air unit. The name is on the plastic cover under the "hood" covering the unit. If yours is also manufactured by Evans, then I would give them a call and explain what is happening. Evans actually fixed mine when we were at a rally they attended.
On mine the heat control valve is in the hose that supplies the hot anti freeze to the heater and is located very near the heater core under the "hood".
Of course we have a CAT diesel rear engine, so gas chassis might be different.
Ron
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