Whirring sound coming from the front end

Discussion in 'Domestics' started by 00oleary315, Dec 28, 2017.

  1. 00oleary315

    00oleary315 Newbie

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    Please fill out the following to ask a question.

    MAKE: Chevrolet
    MODEL: Malibu
    YEAR: 2005
    MILES: 70,000
    ENGINE: 3.5 L V6

    About a month ago I noticed that there was a whirring sound coming from under the hood. It sounds very dull and is hard to notice when the car is going under 35 MPH. The whirring will increase and decrease with the speed of the car, so it is very noticeable when driving on the highway as it can be quite loud. I originally though the can could be low on oil, but since adding oil the sound has continued. I have also heard that a fan blade could be bent which would cause the sound, but if the fan is made of plastic, could the blade really bend much without breaking?

    I know the details are vague, but I am having a difficult time describing the problem, if there is any more specifi information you need, please let me know. I appreciate any feedback I can get.

    P.S. The exhaust system was rotted and was just replaced today. I hoped that maybe the exhaust was the root of the problem and the replacement would solve my issue, but that is not the case.
     
  2. JackC

    JackC wrench

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    Can you make the noise by reving the engine while parked? Or does the car have to be moving?
     
  3. nickb2

    nickb2 Wrench. I help when I can

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    If the sound increases and decreases with speed of car, I would focus more on bearings than the engine. So as Jack asked, do you hear it hood open, revving, idling, or just when in motion at a certain speed?

    Cuz this sounds like a front wheel bearing more than anything else. Rarely have I seen a differential bearing go out on these trannys.
     
  4. nickb2

    nickb2 Wrench. I help when I can

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    When an engine is in gear and moving, most engine noises will not be associated to the speed the car is driving at, but more at which RPM it is revving on load or floating.

    Where as a front wheel drive car will have differential bearings and front wheel hub bearings that will sound off at a certain speed. Try driving the car when it starts to whir and sharp end the car left to right to see if the sound changes. Post back results.
     
  5. 00oleary315

    00oleary315 Newbie

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    Thank you for the quick replies. When the car is in park and I rev the engine, the sound is not present, it is only present when the car is moving.

    Nick, I will test out your recommendation later today and post with the results.
     
  6. JackC

    JackC wrench

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    After you do Nick's test, you can also put one front wheel up at a time with a good jack stand under the frame and take it up to speed to see if the noise is on one side or the other or the same on both sides.
     

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