Skip the auto shop - Our mechanics make house calls

Q: air blend door

asked by on

1) issue: drivers side vents supplying only vent air, while passenger side cold. Changed the actuator motor today and also took off and inspected the cover plate beneath it. after reinstalling everything, the system is totally out of sync. vents dont work. only defrost works. cold on right, hot on left, what a mess. Please advise about syncronizing system. Al

My car has 63000 miles.
My car has an automatic transmission.

A: If you have different temperature from the ...

If you have different temperature from the driver and passenger sides, then that is a BLEND DOOR issue. The blend doors are little triangular devices with centers that rotate from an electrical signal. Their plastic gears can break, or the motor can lose the ability to move them. They are under the dash but reachable from the cabin without removing much more than the black noise panel. They are held in place by 3 screws (philips). At the center of the HVAC near the top, but reachable without removal, is a MODE DOOR. If you have an inability to get the air to blow anywhere but out the defroster, then that is a MODE DOOR issue. The mode door has a lever on the side, and you can move that manually. I would recommend having an expert from YourMechanic come to your home to diagnose and repair.

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: Rear hatch door is'nt working

Hello, thank you for writing in. The small motor that lifts the hatch is designed to do only that. Unfortunately, the extra weight and possibility that it was frozen shut may have been too much for it to handle. Make...

Q: How do I remove the front passenger door lock actuator?

Hello. If the door lock actuator is not coming out, then either there is still some hardware that needs to be removed or it is simply lodged and will require a bit of force to remove. I would carefully check...

Q: Transmission staying in 3rd gear only and not shifting.

Hi there. The transmission could have an issue with the shift solenoids. Check the wiring harness to the transmission case and make sure that it is plugged in. 3rd gear is the only forward gear in a 4L60E transmission that...

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...
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...
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...