Skip the auto shop - Our mechanics make house calls

Q: Growling noise from car. Could be the AC compressor, alternator, or power steering.

asked by on

I have a growling noise issuing form my engine. A mechanic replaced the belt and tensioner, but that was not the problem. Two other mechanics have said it is either the AC compressor, alternator, or power steering unit.

A: All of the possible causes mentioned could ...

All of the possible causes mentioned could be the issue. All of these parts have pulleys that are ran off of the serpentine belt. Most of the pulleys have bearings inside them that allow them to spin freely. If a bearing loses its lubrication, it will become dry and therefore heat up. Once the bearing becomes overheated it will start to make growling sounds. I would recommend the help of a YourMechanic technician. The technician will be able to use an automotive stethoscope to diagnose which pulley is the source of the problem.

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: The Battery Light came up on my dash. I lost power steering and have no cold AC. What should I do and how much is it to fix?

It sounds like you may have lost a drive belt. When the belt goes, so does the alternator, the power steering, and the air conditioner. You should not drive the car like this, as the engine may overheat. You may...

Q: How do you adjust the manual rearview mirror for daytime or nighttime?

If you have a manual rearview mirror, it provides you with the ability to change from daytime driving mode to nighttime driving mode. This helps to reduce glare from headlights behind you and saves your night vision, while making it...

Q: Problem with battery discharging over a couple of hours. Alternator getting hot while running very quickly.

This may be related to a voltage regulator malfunction. This is the resister on the passenger fender well that you are referring to. This is a device that monitors the charging system to be sure the battery is charged at...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...