Q: Heater control valve

asked by on

Where is the heater control valve located on a car

Hello. Typically the heater control valve is in the underhood area mounted near or on the engine compartment firewall. In that location just look for the valve plumbed into what are typically 3/4 flexible rubber heater hoses (often "molded" hoses), one hose "in", and one hose "out" of the valve. Until recently, these valves were mechanically operated via a cable. So, you might see a cable attached to a lever on your valve. With the trend to more electronic controls, on newer cars the valves can be controlled electronically, in which case you will see a wire and plug connection to the valve and no cable or lever. On older cars, sometimes the valves get sticky as the cable, sheath, and lever accumulate dirt and corrosion. You can lightly lubricate the cable and lever with an appropriate lubricant that is safe for rubber and plastics. If you have been directed to this valve because you suspect it is involved in a malfunction or repair issue, feel free to rely on YourMechanic to diagnose your heater control valve issue and help you with any needed repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Heater control valve

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Hot air blows even though the heater is not on. I have a 2007 Jeep Commander

Your car has a heater control valve to control the flow of coolant through the heater core. It is controlled via engine vacuum so that in the case of a failure, it will default to the heat (open) position. Your...

Q: Heater is not working - 2003 Chevrolet S10

Hello. A malfunctioning heater can be caused by many things. The first thing I would do is check to make sure that the coolant is topped off at the proper level. If it is low, coolant may not be reaching...

Q: how to bypass heater core in 2006 dodge caravan

In order to bypass a heater core you will need to disconnect both hose connections at the heater core on the engine firewall and then connect the two hose ends together using a bypass pipe and two hose clamps then...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...