Skip the auto shop - Our mechanics make house calls

Q: Heater won't work from center vents

asked by on

I've had this problem before. My heater was working perfectly fine but the one day it was hot so I turned on my AC and put the temperature to low. Once I turned my heat back on it blew hot for a few seconds then goes cold. The heat blows perfectly hot from the top and bottom vents but not the centeR vents. When I turn it to the "center vents" position after having it on just upper and Lower vents position, it'll blow hot for about 15-25 seconds then go cold again. I had this problem in the summer and it just stopped doing it. What could it be? It seems that whenever I turn the temperature to low it triggers this problem.

My car has 130000 miles.
My car has a manual transmission.

Hello and thank you for contacting YourMechanic. The issue is the blend doors are not adjusting correctly when you adjust the thermostatic switch. Check the wiring in the dash for any loose contacts to the blend doors. Also check the blend doors for any debris trapped in them causing them to stick on the tracks. If you need further assistance troubleshooting your vehicle, then seek out a technician, such as one from YourMechanic, that can assist you with the heater.

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: Belt broke and pulley loose

Hello. If the A/C compressor pulley is loose, it could cause the belt to brake. A check of all the drive belt pulleys would need to be done in order to ensure that none of the other pulleys have caused...

Q: Mechanic recently diagnosed my car and said I had to replace MAF sensor. Replaced it but same codes come up. Bank 2 too lean and 1

Hi there. Sometimes when an error code is triggered it can be caused by multiple components; especially in regards to the fuel or emissions system on today's modern cars, trucks and SUV's. If certain symptoms are discovered and those symptoms...

Q: car vibration

If the struts are defective, that can be a cause of vibration. It sounds like the struts have to be replaced anyway, so I would suggest doing that first. Check the exhaust system (is it all OEM?). Check for damaged...

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...
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...
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...