Skip the auto shop - Our mechanics make house calls

Q: Heater won't switch to other settings

asked by on

The heater no longer let's me switch it off our feet or to any other settings or to the air-conditioning,can you give me some ideas of where to start ,it used to work fine but all of a sudden stopped letting me switch it to other settings,,and now that it's so hot outside I really need the

My car has 170000 miles.
My car has a manual transmission.

A: The most common problem may be the air mix ...

The most common problem may be the air mix door motor actuator being bad. There is a pinpoint test to see if it is the controller where you push the buttons or the door actuator on the evaporator case. You can try tapping on the mix door actuator motor to see if it will move to a different location with the key on. If it starts to work, then the actuator is bad and needs to be replaced. If it still does not move, then have a mechanic do an inspection on your heater to see which part failed.

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: My 1999 BMW blower comes on whenever I put keys in the switch and turn the motor on.

Hi there, thanks for writing in. If this comes on right when the car is turned on, then most of the time it is caused by a bad blower resistor module. This module fails internally and causes this to occur....

Q: Fuse A/C power windows

Hello, thanks for writing in about your 2005 Kia Spectra5. It sounds like those systems may all share that same fuse and one of them is drawing too many amps, or there is a short in the circuit. I wonder...

Q: Car wont run in D at first, need to start in second or first gear.

This may be related to a few different issues such as a faulty shift solenoid or failing torque converter in your transmission. When either of these happen and too much torque is applied (i.e. starting in 1st gear), this can...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...