Q: No air through vents only defrost. Heat only in rear

asked by on

I have checked all vacuum lines and conection on climate control dials and I can not get any air flow through my vents and nothing for rear only heat.

My car has 178000 miles.
My car has an automatic transmission.

A: If no air is flowing through...


If no air is flowing through your vents it may be possible that one of the AC components has failed. Common causes for the symptoms you describe are a faulty blend door actuator or blower motor. The blend door actuator is the component that directs the flow of the air through the vents. If the actuator fails or jams it may not be able to properly direct the system's airflow, or may even cut it off completely. The blower motor is the component that produces the airflow for the vehicle's AC system. If it fails no air will come from the vents at all. It may also be possible that some of the associated components, such as the fuses or relays may be having an issue. I would check those components and then go from there. If you need assistance with this, consider YourMechanic, as a certified technician can come to your home or office to diagnose the issue with your AC and help you repair it as necessary. Best of luck.

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: Black smoke coming from rear tires

Hello. This is very abnormal for your tires and should be looked at by an expert very soon. It sounds like you may have something that is rubbing on the tire causing it to smoke. However, generally when a tire...

Q: Hesitation on take off

A hesitation present during acceleration is usually a sign of a fuel delivery or fuel ratio problem. Naturally, this will be enhanced when the AC is on since the AC increases the load on the vehicle's engine more than normal....

Q: Air vent problems - 2006 Buick Rainer

Hello, thanks for writing in. Either your blower motor is bad or the blower resistor is bad. You should also check the cabin air filter to make sure it is not clogged. If you would like to have this done,...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...