Skip the auto shop - Our mechanics make house calls

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.

A: Hello. This is a common problem on this veh...

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 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・Save up to 30%

Get a quote

What others are asking

Q: Intermittent heat, door motor moves hit and miss. I got anew motor, but this one does not move. I'm assuming there's no electricity to the door motor.

Hello, thanks for writing in. In order to access the heater switch in the dash you will have to disassemble the vehicle's dashboard and center console. Once the appropriate interior trim components are removed the switch can be accessed. I...

Q: My car isn't hard to steer but I was noticing some changes in the steering and when I step on the gaside my engine revs and no psf

If you have been adding power steering fluid multiple times let alone once the system has a leak. With having to add that much fluid, there will most likely be evidence of fluid on the ground under the vehicle. While...

Q: Car shut off while driving

Without additional information, it is hard to say what could have caused this. Your car has a variety of sensors that can cause it to shut down depending on whether or not everything is functioning correctly. I would suggest having...

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...
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...
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.