Skip the auto shop - Our mechanics make house calls

Q: A/C makes loud humming sound

asked by on

Yesterday my mechanic gave my SUV a full synthetic oil change, as well as a cabin air filter change. Now, today I turned on the A/C and there was a very loud refrigerator humming sound that was coming from the dash/engine. Or perhaps more like a truck vrrrrrrrrrr sound. I don’t do any of my own repair work. Everything has been dealer serviced. My SUV makes this sound when the ACC mode is on, without the compressor running, as well as when the compressor is on. There is also a fluctuation in the volume of the fan speed - higher speeds of the fan produce louder sound and the lower fan speeds produce more quiet sound. In your assessment, what will fix this?

A: The blower fan motor has something caught i...

The blower fan motor has something caught in it or the air filter is not in position and hitting the blower fan. Have the person or shop that did the work fix it. The filter may be out of position or was not seated properly and should be fixed to prevent blower motor damage. If you want to have an independent mechanic take a look at this, a technician from YourMechanic can come to your home or office to diagnose your car's noise and make any needed 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

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: Fuse continually blows when A/C is turned on

Hello there. This is a common issue with the Suzuki Vitara. There are a few different faults that could cause the fuse to blow repeatedly and the AC not to function. When a fuse repeatedly blows, this is typically an...

Q: My low coolant indicator light came on and the radiator was low and the reservoir tank was totally empty

Hi there. From the description you have provided, my thought is, your vehicle has a coolant leak. Assuming you added to the cooling system, would account for the temperature gauge returning to normal and low coolant indicator going off. The...

Q: Oldsmobile Alero only starts when engine symbol is on and key is in 'On' position; but while driving car randomly stalls

The engine symbol is the Check Engine Light. Like all of the other lights, the Check Engine Light should illuminate briefly when the key is turned to the accessory or on position. This is done to provide a self-test of...

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 Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...