Skip the auto shop - Our mechanics make house calls

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?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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: Heater not working properly

Common causes of no or inadequate cabin heat include malfunctioning blend door(s) (part of the in-dash ventilation network), a faulty or stuck heater control valve, a plugged heater core, stuck open engine cooling thermostat, collapsed hoses, and low coolant level....

Q: Heater issue

What you are describing sounds like an intermittent failure of the blower motor that circulates air in the HVAC system, however, there are certain faults that could occur in the electric circuit that powers the blower motor. If power is...

Q: Heater is blowing but not hot. Repaired the hole in the radiator. Why doesn't heat up? 2008 BMW X5

Hello - there are several possible causes for a "no heater function". If the thermostat is not allowing the engine to heat up properly (center of the temp gauge), or there is lots of air still in the coolant system,...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...