Q: Car idles rough with AC on - 2008 dodge avenger

asked by on

If I am sitting in a parking lot in park or in neutral, I can turn on my AC no problem and enjoy some cool air, but the second I put it in gear (reverse or drive) it vibrates pretty bad whilst idling, however if i'm driving at a reasonable speed my car runs fine until I reach a red light and the engine is at idle again. Runs great without the AC on at all, and on a side note I tried driving with the AC on driving down the highway and after about 10 miles my check engine light came on, and I shut the AC off. The next day I got in my car and the check engine light was gone, I repeated that two more times (the heat and curiosity made me) and the exact same thing.

My car has 100000 miles.
My car has an automatic transmission.

Hello, thank you for writing in. There can be multiple problems with the vehicle causing your issues. First, we need to take a look at the drive belt which sends power to the AC system from the engine. When the engine is running at idle, the lower speed means less power going to the AC. As it stands now, the engine can not handle powering the wheels, and all the other components driven by the drive belt (alternator, water pump, air conditioning) at the same time. This may be due a slipping drive belt (failed belt tensioner, stretched out belt), a component drawing too much power from the engine, or other similar issues with the drive belt. Since the engine runs fine without the AC running, your engine is likely working fine. You should focus on the AC compressor (connected to the drive belt), the tension of the drive belt, and the condition of the other pulleys connected to the drive belt. For more help with diagnostics, contact our service department to schedule an appointment.

Was this answer helpful?
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. Car idles rough with AC on - 2008 dodge avenger

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: I have the 4 error codes . And I looked them up in the diagnostic book. I was told by a phone representative to ask you

Unfortunately, without the error code numbers this would be difficult to interpret. Please feel free to send us the specific error codes and we will be glad to help you.

Q: What do the controls do on the dual automatic temperature control system?

If your car is equipped with a dual automatic temperature control system, it allows you to set a different temperature for the driver side and passenger side. Once you’ve set the temperature, the system will automatically maintain it until you...

Q: Truck shakes and traction light coming on.

Replacing the water pump in your vehicle is quite a labor intensive job. Part of the job requires removal of the timing chain that runs the engine. If the chain is not reinstalled properly it will cause the engine to...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...
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...