Skip the auto shop - Our mechanics make house calls

Q: Rattling from AC when idling

asked by on

I can hear a rattling noise in the engine compartment when I engage the air conditioner. The air conditioner still works. The rattling sound occurs while idling at stop lights.

The rattling may be from the AC compressor pulley or tensioner for the belt. The tensioner is the most common problem, but the spring may be too weak causing vibrations and rattles. I recommend seeking a mechanic, such as one from YourMechanic, to come and test your vehicle for you. They will be able to diagnose the car noise and replace the belt tensioner if 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

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 just had my exhaust manifold looked over and two mechanics told me I had holes in the manifold

The exhaust manifolds on this engine will warp and cause the exhaust manifold bolts to break off in the cylinder heads. The manifold will need to be removed and drill and tap out the broken bolts in the head. This...

Q: Replacing the ignition key cylinder lock.

Hi there. You do not need to remove the steering wheel. You will have to remove the upper and lower covers to the steering column. Then remove the locking clip and collar on the ignition switch and push in on...

Q: Looking to install an A/C system in a 2007 GMC Sierra work truck. Any idea where I can find a shop manual or video tutorials?

Hi there. The best thing to do is locate a 2007 GMC 1500 Sierra that has a complete A/C system and take pictures of the entire system. Then you can go and buy all of the parts needed to install...

Related articles

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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...