Skip the auto shop - Our mechanics make house calls

Q: Heater not working

asked by on

The heater in my car doesn't work. The fan is always blowing cold air.

Your vehicle has a control valve in the heater hoses the either blocks or allows the hot coolant to flow into the heating system. This control valve is operated by engine vacuum via several solenoids that are controlled by the air conditioning control head. These can be tricky to diagnose so I would ask for help from one of the mechanics at YourMechanic. They will be able to pinpoint exactly what is causing your heat not to work correctly.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Bmw 325xi 2004. There is no heat and the car overheats.

Hi there. For your vehicle to overheat and not have any heater heat in the cab, then the coolant could be low, the water pump could be not working, the radiator could be plugged up, or the thermostat could be...

Q: Truck won't start

Hi There, You may want to check to be sure the fuel pressure regulator is working properly. The fuel pressure regulator is a device which controls the pressure of fuel supplied to the fuel injectors on an engine. This works...

Q: Coolant

You should keep the coolant full at all times making sure to be careful topping off coolant when engine is hot. If you notice engine running hot you should stop and let the engine cool before adding more coolant or...

Related articles

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.