The heater valve is a component that allows the coolant to travel from the engine to the heater core. This process assists the vehicle's heating system by generating heat and warming up the cabin's interior.
Heater control valve principlesThe heater control valve opens and closes to avoid hot engine coolant from traveling into the heater core and helps moderate the amount of heat the cabin receives when using the heater. The valve is restricted by a temperature control dial that is equipped within the cabin.
The heater control is operated by a Bowden cable that controls flaps in the valve. Another component needed to accomplish this operation is the vacuum valve. It allows heat to be provided even when the valve is faulty.
Common problems with a faulty heater control valveA bad heater control valve can lead to leaks. The vehicle is susceptible to overheating making adjusting the temperature to be useless.