Q: Air conditioning is pretty much useless

asked by on

The AC in my 2012 GMC Acadia works intermittently and the AC light will light up on the dashboard right before it fizzles out. I am pretty sick of having this reoccurring problem at 59,000 miles. Is there a part that would fail and make it turn on the AC light then stop working right after?

The A/C indicator light blinking is an indication that the system is low on refrigerant or a defective pressure sensor or wiring issue. The way you described your problem is that it is an intermittent one. The fact that your system works fine at times tells me that most likely your system is not low on refrigerant but instead a sensor or your wiring is the issue. The system has a pressure sensor mounted to the A/C compressor which senses the pressure in the system and if defective could cause the erratic signal causing low pressure indication when the system is not low on refrigerant. I recommend you contact YourMechanic to have a thorough A/C diagnostic test and computer scan for A/C codes. The technician will confirm A/C pressures are normal and electrical wiring is not damaged to the A/C pressure switch. They will then scan the computer and check for A/C codes and diagnose as needed to give you a repair solution to fix your problem.

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

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!
  1. Home
  2. Questions
  3. Air conditioning is pretty much useless

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: What do the various lights mean on the instrument cluster?

Your car’s instrument cluster contains quite a few different lights, all of which provide you with information about different systems (most of which you activate yourself during the course of normal driving). Here’s a quick rundown of what you should...

Q: How Much Does Using the AC Affect Fuel Economy

There are several variables that will influence the answer to that. It depends on your vehicle, how you drive, where you drive, and how hot it is outside. But there are some things that are certain: operating an A/C system...

Q: Car stuck in neutral, shifter is in park.

It sounds like your shifter cable may have come loose or may have broke. I would have your mechanic come out and inspect the car's gear shifting problem.

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...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...