The heater control valve regulates, by opening or closing, the amount of hot water that enters the heater coil.
A good indication that your heater control valve is failing is if your air conditioning is functioning correctly and your system gauge readings are correct, but you’re getting heat or warm air out of the vents. This could be as a result of a failed heater control valve that will not shut off the flow of water to your heater coil. The heater control valve can also fail by leaking, or even by not opening and allowing water to flow into the heater coil in heat-mode.
Due to market changes, we have made the hard decision to no longer offer restoration services. We do offer replacement upgrade kits and bolt in aftermarket kits to cover the void.