Skip the auto shop - Our mechanics make house calls

Q: AC air coming out defrost channel

asked by on

The AC works, but the air is not coming out of the dash vents. Instead, the air is coming out the defrost channel, no matter what I set the air flow switch to.

A: This is an indication that the mode door ac...

This is an indication that the mode door actuator within your dash has gone bad. This actuator is responsible for moving the door that allows or blocks off air flow to a certain vent location. Sometimes this part can be accessed through the glovebox, but other times, the entire dash must be removed. I would start by having an inspection performed of the air distribution box by a mechanic to confirm this diagnosis. If the mode door actuator turns out to be bad, have it replaced soon in order to enjoy the air coming out of your dash vents again.

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: why does the heated side mirror drivers side not work

Hi. There are a couple of reasons why your driver's side heated mirror is not working. The first thing that comes to mind is the fuse for the heated mirror has blown and is causing it not to work. Another...

Q: I have a 2004 Pontiac bonneville, and air blows cold on the passengers side of the car, but not on the drivers side. Any ideas?

Hi there. There is a blend door that keeps the air blowing on the cold and hot sections separate. The blend door maybe stuck between the evaporator and the heater core causing the temperature difference. Also, the air duct on...

Q: Truck over heats while idling

This can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know the coolant fan switch helps to maintain the proper coolant temperature by turning...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.