Q: Humming sound when AC on

asked by on August 26, 2016

Hi, I hear humming sound when turning on AC, it's louder when accelerating, also acceleration seems sluggish when AC on. If no AC there is no sound and car seems normal. Note: AC is blowing cold air and no issues.
My car has an automatic transmission.

If the noise gets louder when you accelerate and goes away with the A/C off then the problem is with the internal bearings within the A/C compressor itself. You should have the A/C compressor checked and replaced if noise is verified to be internal. If you’d like to get this fixed, consider YourMechanic, as one of our mobile experts can come to you and diagnose the sound you’re hearing for an accurate repair.

Was this answer helpful?
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

A/C

I'm not entirely clear, but I believe that you are saying that your AC is not working, but your concern is not with the AC but that the lack of a condenser fan will cause the car to overheat. Some...

My car overheating after 8-10 km on ac i was replaced radiator waterpump and remove thermostat wall now. What can i do

Usually the radiator and water pump are the culprits with symptoms like this. The condenser sits in front of the radiator and it gets hot when the A/C is on. Like the radiator, it relies on air flow to cool....

Do I need a new water pump?

Generally, when a water pump is going bad, you may hear a bit of a whining sound combined with the pump leaking. The most common place for the water pump to leak from is the pulley shaft seal which is...

Related articles

How Often Does an AC System Need to Get Recharged?
Your car’s air conditioning system is a lot like your home’s central heating and air, and even more closely resembles the system that keeps...
What Causes the AC System to Leak?
Your car’s air conditioner is responsible for keeping the interior cool and comfortable on hot days. However, in order to do that,...
A Buyer’s Guide to the 2011 Buick Lucerne
2011 2011 marked the final year of production for the Buick Lucerne, a venerable full-sized sedan that offers ample room in the interior. The car was noted for the significant amount of interior space and trunk space offered, although it...