Skip the auto shop - Our mechanics make house calls

Q: Car whistling and shaking when driving and running the AC

asked by on

My car is making a whistling noise and shaking when I drive and run the air conditioner at the same time.

A: Greetings! I will be happy to help. Your de...

Greetings! I will be happy to help. Your description leads me to believe that both of your issues could relate to your serpentine belt. The belt wears out over time, and will at times try to notify the driver of an issue by making a whistling or a squeaking sound. The AC system is belt-driven, so an issue with the belt could cause problems in its performance, such as a shake. However, most of the AC system's vibrations should be absorbed by the motor mounts, so you should not be experiencing too much shake behind the steering wheel, unless the motor mounts are faulty. Therefore, I also suggest checking the motor mounts for wear and deterioration; factory motor mounts are made of rubber and the rubber insulation becomes brittle over time.

A good place to start is by having a certified mechanic, such as one from YourMechanic, come out to the location of your Pontiac to run an inspection on your AC system, and replace your serpentine belt, if deemed necessary.

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: Car won't run after running rough

Hello, from your description it sounds like you might have fuel injector that is stuck open. A stuck open fuel injector will let fuel just flow into a particular cylinder, letting raw fuel just go strait into the exhaust without...

Q: Various problems with driver's side of car.

Looking at the wiring diagrams there is no correlation or common issue that tie together the AC, wipers, and speaker issues. For the heat issue where the drivers heat is staying there is either an issue with the front mode...

Q: Car won't pick up speed

A number of things could be causing this issue. Some possible problem parts would include throttle cables, computers, fuel or ignition issues, or even something as simple as a sensor. My best recommendation would be to have your vehicle thoroughly...

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...
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...