Q: Air does not come out of the vents very well or at all most of the time. Air does come out of the defrost though.

asked by on

The air vents hardly blow air out of them and it's usually when I step on the brakes. It also produces a whistling sound like the air is trapped. My defrost works just fine so it made me realize it is not the blower motor but probably something else.

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

A: Hello there, a few different things can cau...

Hello there, a few different things can cause the air to only blow out of the defrost vents. The car's HVAC system uses a few doors, such as the blend and mode doors to direct the air through the dash and determine where it comes out and what temperature it is. Given that the air works out of the defrost, the most likely cause would be the mode selection vent. A qualified technician, such as one from YourMechanic, will be able to diagnose your AC issue and perform any repairs required.

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: Truck wont start on its own needs throttle to start

Hi and thank you for contacting us. There are 4 things that could cause a problem with starting and bogging of a diesel engine. First, you will need to check the air filter. Unlike gasoline engines, diesel engines require a...

Q: Loss of power

Hi there, thanks for writing in. Most of the time this is caused by a fuel system issue. I typically check the fuel pressure first. If the pressure is low, then the pump is bad. If the pump is fine...

Q: Monitors won't reset

The monitors only reset after each test has passed. The monitors will need to take in some driving, at different speeds and conditions, for the change to pass. If they do not pass after driving for a few days, then...

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 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...
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.