I now the mono-valve has no bearing on vent selection. Kinda 2 separate problems. When I move the temp to hot, I get HOT(heated) air. I had a thermometer in the center vent and it was basically blowing ambient (upper 80's today) air but when I switched the temp all the way hot, I got HOT (heated) air. Still could be the mono-valve ?

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Sharing my partner's 2012 Forte 5dr SX til I find my next 123 or 126..
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Do I miss being a service advisor ???