Skip the auto shop - Our mechanics make house calls

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.

A: Based on your question I believe that you a...

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?

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Check Engine light P0304.

The code P0304 points to a misfire on cylinder number 4. Ford also has a funny cylinder identification pattern, different from many makes, and a diagram should be consulted to determine which cylinder is the right one. The spark plugs...

Q: Car cuts out 2004 Ford Fiesta

Hello - there are several possible sources of your stalling issue - bad idle air control valve, dirty throttle body, leaking injectors, etc. Yes, it would also be a good first step to check for problem codes, even if the...

Q: A/C-Heater blower not working

Try to disconnect the blower motor to see if the fuse blows again. The motor is shorted most likely. The motor fried the module (resistor) and may of fried the new one. Try disconnecting the module and blower and see...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...