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.
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    Where is 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. via

    Can heater control valve cause no heat?

    Some vehicles use a heater control valve that only opens (allowing hot coolant to flow through the heater core) when the heater control calls for hot air. The heater will fail to produce warm air if the control valve is stuck closed, leaking or disconnected from the heater control. via

    How do you know if you have a bad heater control valve?

  • No heat comes out.
  • Heat is always on and you can't turn it down.
  • Heater operates erratically, putting out more or less heat without any control changes.
  • Coolant leaks.
  • Low coolant level.
  • Higher-than-normal temperature gauge readings (from loss of coolant)
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    What causes a heater control valve to go bad?

    Heater control valves can also leak from excessive corrosion from contact with old or contaminated engine coolant. Usually a leaking control valve will have to be replaced in order to repair the leak. via

    Why is my heater not blowing hot air in my truck?

    Faulty heater cores and low or contaminated coolant levels often come hand in hand, and both issues may lead to your engine overheating and your heater not blowing hot air. via

    Does the heater control valve affect the AC?

    If the heater control valve fails or gets stuck, it will not be able to allow hot coolant into the heater core so that the heater can operate. If the heater does not have hot coolant the AC system will not be able to blow hot air, and the front defroster may not work. via

    What is the function of a 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. via

    How do I know if I have a bad heater core or thermostat?

  • 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.
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