Skip the auto shop - Our mechanics make house calls

Q: AC running but not blowing.

asked by on

Good evening, I'm experiencing an issue with the HVAC system in my pickup (dual zone climate control, no rear). I turned my truck on the other day, and while the compressor was kicking on and off, as it should be, no air was blowing out of the vents, regardless of fan speed setting. I removed and reinstalled the HVAC battery fuse, as well as the HVAC blower fuse. After that, I played with the ac controls for a little while until it started blowing air again; but, while it was blowing cold on the driver's side, it was blowing full hot on the passenger's side. After looking online, I saw to set one side as cold as possible and the other as hot as possible for a couple of minutes, then to shut the ac off for a minute or so. Then, it said to do the opposite and shut it off. After that, it said to run the ac at a normal temp. This actually did the trick, and the ac started blowing in line with set temps. It did it again today, and that trick worked again. Any ideas for a permanent fix?

My car has 72000 miles.
My car has an automatic transmission.

A: When your heater control valve fails, this ...

When your heater control valve fails, this can cause the vehicle to heat one side and not the other on a dual zone system. I would recommend having your heater control valve tested using the manufacturer’s recommended procedure to ensure that it is functioning properly. If the heater control valve is malfunctioning, I would recommend having it replaced.

As for the blower, it is possible that the blower motor or blower resistor could be failing. It is also possible that the connector to the blower has melted and will require a pigtail connector to replace it. If you need to have this all scoped out, a qualified professional from YourMechanic can come to your car’s location to diagnose the AC system and guide you through the proper repairs.

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: My emergency brake pedal is stuck in the up position.

Many common faults can cause your 2001 Chevrolet Tahoe's parking brake to get stuck in the "up" position. If the parking break will not apply, the brake cable could have failed, the parking brake lever could be faulty, or there...

Q: replaced serpentine belt now no ac

If the a/c was working before you changed the belt and not it does not work and the belt squeaks then you may have put the belt on incorrect and it is blocking the a/c clutch from engaging. Check each...

Q: My 2017 silverado keeps displaying a theft attempted message. How do i remove that?

Hi there. Since your truck is brand new, I would recommend contacting the Chevrolet dealership where it was purchased. This type of warning light typically indicates a glitch in the ECU that can only be reset by the dealership since...

Related articles

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...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...