The heater valve is controlled by the interior heating controls. When you turn on your vehicle’s heat, the valve opens and allows hot coolant to enter the heater core, which then warms the air entering your vehicle’s interior.
Car OBD Codes, OBD-II Codes, Error Codes
The heater valve is controlled by the interior heating controls. When you turn on your vehicle’s heat, the valve opens and allows hot coolant to enter the heater core, which then warms the air entering your vehicle’s interior.