Signs of a Malfunctioning Heater Control Valve

The heater control valve is a cooling and HVAC system component that is commonly found in most of the cars.

The heater control valve is normally mounted near the firewall and acts as a valve that controls the flow of the coolant from the engine to the heater core.

When the valve is opened, the warm engine coolant passes through the valve and into the heater core, so that hot air can be produced from the car's vents.

Whenever the heater control valve fails it can cause issues with the car's cooling system and also with the operation of the heater.

Here are the signs exhibited by a malfunctioning heater control valve.

Heater doesn't work

Heater doesn't work

One of the first symptoms of a malfunctioning heater control valve that you will come across is the inability of the heater to produce warm air.

When the heater control valve breaks or malfunctions, the flow of the coolant to the heater core gets restricted or stops completely.

Consequently, without the constant flow of coolant to the heater core, the heater will not be able to produce warm air for the cabin.

Heater doesn't work

Leaking coolant

This is one of the most common issues associated with the malfunctioning of the heater control valve that is a coolant leak.

In due course of time the heater control valve can wear out and crack which will cause the coolant to leak from the valve.

Moreover, the heater control valve can also leak from excessive corrosion which is caused due to contact with old or contaminated engine coolant.

Heater doesn't work

Erratic heater behavior

If you come across erratic behavior from the engine, then this is also a sign of an issue with the car's heater control valve.

A malfunctioning heater control valve will not be able to properly control the coolant flow to the heater which leads to problems in operating the heater.

Moreover, the heater may produce hot air but only at certain times like in the idle condition when hot air may come and go.

Heater doesn't work

Conclusion

Whenever you come across the abovementioned signs, then you can be sure that the heater control valve has malfunctioned.

You must immediately take your car to an automotive repair shop to fix the issue as further delay can also affect the other components of your car.

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