How do I know if my heater control valve is working?
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.
- Heater doesn’t work.
- Leaking coolant.
- Erratic heater behavior.
How do you test a heater control?
Pinch off the hose on the outlet side of the heater control valve (the hose closest to the firewall) and drive the vehicle at highway speeds. If the blower stops blowing hot air, you’ve found the problem. And, if the air conditioning runs colder with the hose clamped off, the valve is causing the problem.
Why is my car heater not turning on?
Most Common Causes of Car Heater Malfunction The heater switching system might be faulty. The cabin air filter might be choked, restricting the airflow through the heater core. The thermostat valve might not be working right. The heater core might be clogged.
Where is heater control valve located?
heater inlet hose
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.
How do you remove a heater valve?
Part 1 of 1: Replacing the heater control valve
- Materials Needed.
- Step 1: Disconnect the battery.
- Step 2: Raise the vehicle.
- Step 3: Place the drain pan under the vehicle.
- Step 4: Remove the lower radiator hose.
- Step 5: Locate your heater control valve.
What happens when the 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 if you bypass 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.
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.
Can a heater control valve cause no heat?
Heater Control Valve Stuck The heater will fail to produce warm air if the control valve is stuck closed, leaking or disconnected from the heater control. Follow the same steps to check if a heater core is clogged, only you’ll also want to feel the heater hoses on both sides of the valve.