Skip the auto shop - Our mechanics make house calls

Q: When I turn the ac on it makes a very loud squeal that stops after a few minutes. 2007 Jeep Commander

asked by on

Yesterday my alternator belt was removed because of one of the pulleys also making noise. After that the same belt was put back on. Today when I turned my ac on for the first time all day it made a loud squeal after I turned the ac off the squeal stopped. It happened on both the cold and heat settings. I have no idea whats going on but its scaring the crap out of me. Im praying its not my ac compressor. Could you please give me an answer as to what on earth happened? It was literally over night.

My car has 147000 miles.
My car has an automatic transmission.

Hi there - It’s possible that the tensioner/idler pulley for the serpentine belt(https://www.yourmechanic.com/services/loud-squealing-or-rattling-is-coming-from-engine-inspection) by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

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!
  • Home
  • Questions
  • When I turn the ac on it makes a very loud squeal that stops after a few minutes. 2007 Jeep Commander

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: Ticking and rattling after parts were replaced

It sounds to me like the valve timing is now incorrect. The pin that you are referring to might be an alignment pin of some kind. If the valve timing is not correct, this can cause the valves to tick...

Q: Smoke started coming out of my Jeep engine. I stopped driving, had a look, I believe my serpentine drive belt has snapped.

Several faults can cause your serpentine belt to snap. If the serpentine belt snapped it should be fairly easy to see. The belts fail for many reasons but the most common would be a failed belt, seized accessory, belt tensioner...

Q: I was told my steering angle sensor has a short in it. When ever I first start driving it will randomly lose power to the gas pedal.

Hi there. Use a diagnostic tool and check the data from the steering angle sensor. See if the steering angle changes and the wheel velocity is displayed when the steering wheel is moved. If no change, then the steering angle...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.