Skip the auto shop - Our mechanics make house calls

Q: Heater only blowing cold air

asked by on

The Heater in my car won't work, but blows cold air.

A: This can be caused by a number of things. I...

This can be caused by a number of things. I'll start by checking the coolant level in the engine. If the coolant level is low, then this will occur as the coolant will not go into the heater core. If the coolant level is fine, then it may be a blend door motor. These are located under the dash, and they open and close the doors to change temperature and air flow. If the coolant level is fine, then I typically take part of the dash apart to see if the actuators are trying to function. Most of the time, you can see them trying to function as this will indicate that the motor is failing. If you plan on having this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the heater issue and make the appropriate 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

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・Save up to 30%

Get a quote

What others are asking

Q: Transaxle light coming on

With the engine fully warmed up and running in PARK, open the hood and look for the transmission dipstick. Pull it out and give it a wipe. Dip it back into the tube and pull it out, this time noting...

Q: Brake ABS CEL on/off . ABS pulses once during braking, electrical system goes weak, wiper and lights weak.

I don't know if all this started happening simultaneously or if these issues have been slowly accumulating, but here is how I would proceed: begin with a battery test and clean and make sure to tighten the cable connections. Replace...

Q: Starts for a second, dies, and won't start again unless you disconnect battery.

Hi there. The symptoms that you are having seems to be with a faulty PCM (powertrain control module, computer). If you are able to reset the computer by disconnecting the battery, then restart the vehicle, there is an issue with...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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.