Skip the auto shop - Our mechanics make house calls

Q: Car makes sqealing noise when AC is turned on

asked by on

Car makes loud sqealing noise when AC is turned on.

My car has 140000 miles.
My car has an automatic transmission.

Your car has what is called a serpentine belt which drives most of the major engine components, one of which is your A/C compressor. When this belt is worn or loose, it will create a very loud screeching sound as you describe. This is often times a relatively simple fix when equipped with the right tools. I would recommend having an expert, such as one from YourMechanic come to your home or office to diagnose and repair the squealing noise.

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!
  1. Home
  2. Questions
  3. Car makes sqealing noise when AC is turned 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: having charging problem

Hi there. It sounds like the battery could be having some issues internally and causing your low idle or the alternator belt does not have proper tension. Battery damage may have occurred when it was discharged during use when the...

Q: Overheating and cold air form vent

Overheating at idle is sometimes a consequence of inoperative electric radiator cooling fans so the operation of those fans should be checked first. Other causes of overheating are a partially plugged radiator, inadequate coolant in the system, a faulty radiator...

Q: 1998 Lexus es300. Can no engine compression mean bad computer and not engine replacement?

An engine computer cannot control, or affect, "basic" engine mechanical compression, that is the level of cylinder compression measured in a static test. Even in the complete absence of any engine computer, the basic specified compression of an engine will...

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 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...