Q: My ac only blows through defrost vents

asked by on June 08, 2016

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.

AC is not working Inspection $96.46 - $116.46 Get a Quote

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

2010 toyota [corolla](/topics-corolla/) 1.8 [engine](/topics-engine-toyota/) seems to sputter when i slow down to turn or slow to a stop sometimes

P2196 OBD-II Trouble Code. came and went in 24 hours. 4 starts.

If the mechanic tested the output (functioning) of the oxygen sensor, especially according to the protocol at this link and found that the sensor was non functioning at that time, what you might be experiencing is a "failing" oxygen sensor...

My car was recalled last year for power steering failure and it was fixed.

This is a vehicle safety issue. You can contact Ford Motor Company, at their main customer service number, and also contact the National Highway Traffic Safety Administration (NHTSA) Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov. You...

Driving down the road in 2013 Nissan altima coupe and the vehicle stopped pulling on its own.

Hi there. If you have replace the sensor and the codes are coming back on, the there could be an issue with the shift solenoids inside the transmission. The code P0500 is coming up for the output shaft speed sensor...

Rough idle and RPM fluctuation

This may be a sign of a faulty MAP sensor. The Manifold Absolute Pressure (MAP) sensor senses engine load and generates a signal that is proportional to the amount of vacuum in the intake manifold. The engine computer then uses...

Looking for a car that is good in winter

Hello. If you’re going to buy a Sante Fe that offers all wheel drive or four wheel drive, it should hold up pretty well in the harsh winter weather conditions. A Sante Fe with front wheel or four wheel drive...

Car cranking longer than usual

Cars have many sensors. These sensors are used to give the cars computer information about what is happening. The computer uses the information to determine what it needs to adjust to keep everything running as smooth as possible. When the...

Hard to steer.

These vehicles have hydraulic power steering systems. If any fluid is leaking from the system it can cause the system not to function properly. The basic parts of the system include the power steering pump, lines, rack and pinion, and...

Related articles

The Best Used Cars to Buy If You're a Dog Trainer
If If you are a dog trainer, you expect a lot from your vehicle. You want a ride that is safe, roomy, and of course, dog friendly, since your training operation will often mean that you need to transport the...
Dodge Certified Pre-Owned (CPO) Car Program
Drivers Drivers who are shopping around for a used Dodge vehicle may want to consider cars under the Dodge certified pre-owned program. Many manufacturers have a certified pre-owned (CPO) program, and each one is set up differently. Read on to...
2012 Chevrolet Silverado vs. 2012 Dodge Ram: Which One Should I Buy?
When you are looking for a way to get a load of mulch or gravel, or need to haul a large trailer or boat behind your vehicle, chances are you are looking for a truck. Trucks are not meant to...