Model: Suburban w/rear air
Engine Size: 5.7
Refrigerant Type: R134
Does hot water circulate through the heater core all the time or does the water control valve shut the flow off when the AC is on? Seems like it should. If hot water is running through the core it will affect the temp of the AC output right?
I don't know the specifics of you vehicle but temperature is usually controlled by a blend door. Hot on one side and cold on the other. By moving the temp control, it moves the door to one side or the other but heat is normally always present. It allows you to mix some warm air with AC air for those cool/humid mornings that fog up the windows. Vehicles that do have a coolant flow valve for the heater core vary in control method. Some close the heat valve manually while others are coolant temp switch controlled or controlled by the engine's thermostat.
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