Skip the auto shop - Our mechanics make house calls

Q: Revving and humming noise while driving - 2006 Scion xA

asked by on

Several days ago while driving my car, a revving sound developed. I thought perhaps it was the engine revving, but I noticed that the RPM gauge was normal. Today, the revving/humming noise begins after I’ve been driving about 20 minutes and the sound lasts about 6-8 seconds. It will repeat this by continuing on/off for about 5-6 times and then the sound stops. The car drives well and no problems to report with the starting, accelerating, braking, etc. There are no lights on the dashboard. I took it to a mechanic and he couldn’t find the problem. In your experience, what is causing this revving and humming sound?

A: It sounds like your cooling fan kicking on ...

It sounds like your cooling fan kicking on and off. It’s even louder and more pronounced when the AC is on. The strain on the engine also will cause the RPMs to jump up a little bit during these cycles. If you would like to have this checked, a qualified professional from YourMechanic can come to your car’s location to diagnose the noise and recommend a correction.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Advice on buying a '93 Lexus SE with a 2JZ engine with a blown head gasket

If they did blow the head gasket, there is no saying what they did to the engine. You can of course, take it apart. It's a nice engine. It's a straight six -- not a V6. So you only have...

Q: Hi, I have a Scion XA 2006. Last year I noticed a squeeking sound while starting the car. It went away the second I drove out of t

Hello. There are a couple of common causes of this noise on your vehicle. Most of the time this is caused by a failing belt tensioner, a bad water pump, or a failing alternator. All of these will cause this...

Q: Power steering went out. Turn signals and speedometer won't work. As well as heating

Hello there, many faults will cause your power steering to go out and the P0500 and P0705 codes to be found on your 2010 Scion. Without knowing the model of your vehicle I can only offer general advice. If both...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...