Skip the auto shop - Our mechanics make house calls

Q: When I turn the AC on, it makes like a rattling noise under the hood. As I keep the AC on, the sound gets louder.

asked by on

Rattling noise when I turn AC on and it increases if I continue to leave the AIR on

My car has 41000 miles.
My car has an automatic transmission.

A: Your car's air conditioning system is d...

Your car's air conditioning system is driven by an air conditioning compressor that has a small clutch on compressor pulley. When this becomes worn out or not properly lubricated enough, this can cause it to fail which can make a very loud rattling noise as you describe. To avoid any unnecessary repairs, I would suggest having an expert from YourMechanic come to your home to diagnose your AC system and help you fix it accordingly.

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: Cars stalls when the AC is turned on.

A seized AC compressor can stall your engine when you turn on the air or defroster because it sends a signal to engage the clutch on the compressor, which causes more resistance than normal. But there are switches that level...

Q: I BELIEVE MY AIR COMPRESSOR WENT OUT ON MY2012 BUICK LACROSSE CAUSE AIR WILL NOT COME ON, IF I CONTINUE TO DRIVE IT LIKE THAT WILL

I am going to assume the air compressor you are speaking of is your air conditioning compressor. If this is correct, the answer is your A/C (air conditioning) has nothing to do with your car overheating. There are components in...

Q: when u press the push button switch, ignition comes but doesn't start

Quick checks that may get your Toyota started: Be sure you are pressing on brake pedal. Try starting it in "Neutral" instead of "Park". Check the 30A fuse named "Start" in the underhood fuse box. If none of these are...

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...