Skip the auto shop - Our mechanics make house calls

Q: AC knocking when it is turned on

asked by on

I think there is either a problem with the blower or fan belt. When the air conditioner is turned on, it starts making a catching/knocking sound. As soon as it is turned off, it stops.

A: Hi there. It sounds to me as if your AC’s f...

Hi there. It sounds to me as if your AC’s fan is interfering with something in the track of its spinning. Also your issue can point to your AC compressor clutch not gripping the pulley correctly. I’d suggest having a certified mechanic sent by YourMechanic come to your residence and correctly diagnose the air conditioner’s symptoms that your vehicle is experiencing.

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: No cold air from AC

Hi there. Most AC systems will leak small amounts of refrigerant over time and lose the ability to cool. The leakage in small amounts is expected to happen on any AC system. I suspect that this is what has happened...

Q: Transmission not working correctly.

The gear shift locked and not coming out of park is most likely a brake light fuse is blown and would need to be checked. It is fuse number 8 in the fuel box. If it blows again then a...

Q: Installed new battery won't start - 2001 Dodge Durango

There are number of things that may cause an engine not to start which may or may not be related to the battery. This may be related to many different possibilities, some of which may be related to a lack...

Related articles

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 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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...