Where is the heater control valve located?

inlet hose
The heater control valve is typically in line with the heater core’s inlet hose, which is often near the vehicle’s firewall, but the exact location of the valve will vary by vehicle.

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

Common signs include the heater not working, coolant leaking from under the engine, and no voltage across the heater control valve….Usually a bad or failing heater control valve will produce a few symptoms that can alert the driver of a potential issue.

  1. Heater doesn’t work.
  2. Leaking coolant.
  3. Erratic heater behavior.

What happens if you bypass a heater control valve?

Your heater control valve works to deliver heat from the engine to the passenger cabin of your car, and if it has been bypassed, then the cabin will not receive heat. Instead, it will be dissipated by means of the bypass hose.

What happens if you bypass heater control valve?

What happens when heater control valve goes bad?

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.

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.

Can a 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.

Can heater control valve cause no heat?

What are the signs 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.

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

How do you diagnose a bad heater control valve?

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)