Q: AC rattling and Alignment Check Gauge Light coming on.

asked by on

Check Gauge Light comes on when tachometer reaches between 2000 and 2200 RPMs. I also noticed a rattling sound when the AC is on.

Based on your question I believe that you are having an issue with the serpentine belt tensioner on your truck. The serpentine belt is on the front of the engine and drives all the accessories attached to the engine. This includes the a/c compressor, water pump, alternator and power steering pump. It is possible that your belt tensioner has failed. This will cause a rattle sound under certain conditions and could cause the belt to slip which could stop the alternator from charging the battery. If this occurs, this will make the check gauges light to come on and alert the driver that there is a problem. I would keep an eye on your battery charge indicator and water temp gauge to avoid any issues until you can ask for help from a mechanic.

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. AC rattling and Alignment Check Gauge Light coming on.

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: Car is running fine (somewhat) but have P0345 code (cam shaft position sensor).

The most common cause of this code is going to be the timing chain and timing gear phasers along with cam solenoids can all cause the problem of cam misalignment. The problem can cause low power, rattles and check engine...

Q: When letting off the accelerator, the vehicle will jerk (it feels like a slight back and forth movement)

Hello. I think what we are looking for here are possible problems caused by a "torque-reversal" in the drivetrain. That is, when accelerating or maintaining road speed, the engine/transmission and all the drive links (driveshafts, differentials, transfer case, etc.) have...

Q: How do I turn on the defogging logic feature?

The defogging logic feature automatically controls the air intake to keep the window from fogging up. To set the defogging logic system, follow these steps: 1. Turn the ignition to the ON position. 2. Press the Defrost button. 3. Press...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.