Question: What Does A Heater Control Valve Do?

How do I know if my heater control valve is bad?

Here are some of the warning signs of a bad heater control valve:

  1. No heat comes out.
  2. Heat is always on and you can’t turn it down.
  3. Heater operates erratically, putting out more or less heat without any control changes.
  4. Coolant leaks.
  5. Low coolant level.
  6. Higher-than-normal temperature gauge readings (from loss of coolant)

What are the benefits of having a heater control valve?

Your heater valve is also useful for adding additional cooling to an overheating engine. By opening the heater control valve, you can allow additional coolant to flow through your heater core. The core acts as an additional mini-radiator to keep the coolant system from overheating for a longer period.

What happens when a heater control valve is bad?

A faulty heater control valve may not be able to properly control coolant flow to the heater, which may result in problems with operating the heater. The heater may produce hot air, but only at certain times, such as at idle, and the hot air may come and go.

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Can you bypass a heater control valve?

Heater control valve bypass is not standard on vehicles; it is a modification. When bypass hoses are installed, the coolant in your car will always be circulating through the heater core – that means that if the core starts leaking, you won’t be able to turn it off.

How do you test a heater control valve?

How Do You Test a Heater Control Valve?

  1. Bring the engine up to operating temperature and switch the heater to the hottest setting.
  2. Check the temperature of the valve’s outlet hose (between the valve and the heater core)β€”it should feel nearly as hot as the valve’s inlet hose.

How much does it cost to replace a heater control valve?

The average cost for a Heater Control Valve Replacement is between $180 and $202 but can vary from car to car.

Why is my car blowing cold air when the heater is on?

Problems with the vehicle’s heating system can be either no air or only cold air coming out of the heating system. A car heating system blowing cold air can be due to a faulty thermostat, low coolant fluid level, malfunctioning heater core, a leaking cooling system, or problems with heating controls and blend door.

Do I need a heater control valve?

You turn on the heater when it’s cold and warm air blows in at you. That’s why it is surprising for some people to learn that the heater control valve is a necessary part of how the heater works because it allows coolant to pass from the engine itself through the car heater where it’s able to warm you up.

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Where is the heater control valve located?

The heater control valve allows the flow of coolant through the heater core to be controlled and switched on and off without affecting the operation of the rest of the cooling system. It may be located on the inlet or the outlet port of the heater core and activated by a cable, electronic control, or a vacuum signal.

What are the symptoms of a bad heater core?

Five Signs Your Car’s Heater Core Is Going Bad

  • Fog Inside Your Car. Two things could be going on if you have fog inside your car.
  • Sweet Smells in the Car. The sweet smell in your car might not be your perfume or the donuts you’re taking to work.
  • Constant Engine Coolant Loss.
  • Cold Air in the Cabin.
  • Cold Cabin/Hot Engine.

Will a bad heater control valve cause overheating?

Another symptom of a problem with the heater control valve or it’s hoses or connectors is a coolant leak. A coolant leak at the heater control valve is not only a problem in that it will disable the heater, but it will also compromise the cooling system which can cause the engine to overheat.

How do you fix a heater control circuit?

To fix this, check for any blown fuses and disconnect the oxygen sensor connector. Using the voltmeter, with the engine off, check whether there’s a 12V fused battery feed to the heater element. If you see no voltage, then repair the short or open in the B+ feed circuit.

Is it OK to bypass a heater core?

If you have a bad heater core, you should get your car in for repairs right away. Driving with a faulty heater core can be risky, as it can lead to overheating and extensive engine damage. Bypassing the heater core is highly discouraged. Problems WILL come up if you decide to do so.

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How expensive is it to replace a heater core?

Replacing the heater core can be an expensive job, and usually costs between $564 – $927 for parts and labor. The parts aren’t particularly expensive, normally costing $80 – $234, but the location of the heater core means that labor costs tend to be quite high.

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