Q: My ac only blows through defrost vents

asked by on

Okay well my ac currently only blow through my defrost vents, it was freezing cold for awhile but now it's hot, I put ac coolant in the truck and I heard a hissing coming from in front of the radiator, making me lean towards a bad ac condenser but would a leak in the condenser cause my ac to blow through my defrost vents only? Because I was told it's a vacuum leak but that's the only leak iv found and it wasn't hissing or anything until I recharged my ac (which was completely empty)

My car has 252000 miles.

Hello. From the symptoms you’ve described it would appear to me that the vehicle may have more than one problem.

The hissing coming from the AC condenser may be a sign of a potential leak, especially if it occurred after you added refrigerant. I’d check to make sure the refrigerant is at the correct level and that there are no leaks present, as any AC refrigerant leaks can cause problems with the functionality of the AC system.

In regards to the air only blowing from your defroster vents, I would check the vehicle’s AC mode switches, and blend door actuator to make sure they are operating soundly. The AC switch controls the modes that the AC blows through, so any issue with the switch may cause problems with what vents the system can operate from.

The blend door actuator is the component that mechanically selects what vents the AC system works through, and if it fails or gets stuck, can produce the symptoms you are experiencing.

If you need assistance with these checks, see the help from a certified mechanic who can diagnose your AC issue firsthand and fix it accordingly.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. My ac only blows through defrost vents

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: "No bus" code

When the No Bus message appears in your instrument cluster, its usually an indication that there is a problem with the powertrain control module or the wiring to it. This is also very likely the cause of your no start...

Q: Car makes cracking sound.

From what you're describing, it sounds like there is something happening in your brakes that shouldn't, have your brakes checked by a certified mechanic to verify that they are ok, if nothing irregular is found I would warranty suspension bushings,...

Q: My truck originally started having difficulties with shifting.

Hi there. The transmission is slipping and breaking down from the inside. When the fluid was replaced, the fluid may have cleaned some parts of the transmission, but then the fluid could have cleaned too much of the materials making...

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...
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.
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.