Can you test a heater control valve?
How Do You Test a Heater Control Valve? Bring the engine up to operating temperature and switch the heater to the hottest setting. Check the temperature of the valve’s outlet hose (between the valve and the heater core)—it should feel nearly as hot as the valve’s inlet hose.
What is the job of the heater control valve?
The heater control valve (sometimes called the hot water valve) is used to control the rate at which coolant flows through the heater core. The valve is located on the heater inlet hose. Manually operated systems may use a cable, a vacuum motor or an electric solenoid to operate the valve.
When do you need to replace a heater control valve?
Never drive an overheating vehicle or an extended period of time. Typically, the mechanical heater control valve is replaced because it is leaking. The mechanical unit can leak coolant or the vacuum diaphragm can rupture causing a vacuum leak which will stop control valve operation.
What causes a heater control valve to stop working?
The mechanical unit can leak coolant or the vacuum diaphragm can rupture causing a vacuum leak which will stop control valve operation. The cooling system is pressurized so a coolant leak at the control valve can cause the coolant level to become very low and cause the engine to overheat.
How does a gas control valve on a water heater work?
Here’s what you need to know about replacing your water heater’s gas control valve. The gas inlet connects to the gas control valve, which then, as the name implies, controls the flow of gas to the unit. The gas control valve allows the pilot to be ignited, and the lit pilot heats the thermocouple.
How do you open a heater control valve?
Tip: While waiting, command max heat from the climate control and turn the fan speed to the highest setting. This will open the heater control valve and allow coolant to flow through the heater core to remove and air from the system.