Q: AC stops working occasionally

asked by on

Hi. The AC in my car is not working correctly. On trips that last about an hour or more, it stops cooling and barely works. Occasionally, when it doesn't work at all, it sounds as if it is working pretty hard. Restarting helps sometimes. Usually, it takes about half an hour for it to be turned off so that it could start cooling again. The car has a mileage of about 115,000 miles. How can I fix this? Thanks.

Hello. This is a common problem on this vehicle. It is usually caused by a failing actuator under the dash. It can also be one of the temperature sensors but that is not as common. I usually install a scan tool to monitor what the AC module is requesting. If it starts to get hot for no reason I then check the actuator to see if it stops holding the blend door in the right position. If not, then the actuator needs to be replaced. If the actuator is fine then the sensors need to be checked. If those are also fine I reprogram the control module and then replace it if it will not hold the programming. If you need to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your AC system and make the correct repair(s).

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. AC stops working occasionally

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: Q: Air conditioning doesn't work

Modern cars have complicated HVAC systems that are heavily controlled and monitored by the car. The most likely cause is a blend door or a temperature control door has failed. A qualified technician would be able to diagnose the issues...

Q: I have a 2010 GMC Terrain that is overheating. I found out it only had about a quart of coolant.. what is my next step?

If the car is still overheating, even after filling the coolant system (and making sure there is no trapped air, which itself will cause overheating) just request an overheating diagnostic during which a certified mechanic will determine which of the...

Q: Hello i just i started my car and didn't let it warm it showed a sign on the dash engine power reduced i just discovered i have a

The problems will be two different ones unless the failure code is for loss of fuel tank vapor pressure. I would recommend having fuel leak fixed first and then having the computer scanned for the failure code to see what...

Related articles

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...