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Tom Cardosa
Tom ... 10/3/2012
2008 BMW 535xi Base 6Cyl3.0L - Engine
Why does the fan seem to be working to hard when I start up and drive.
It is loud. Almost like it's going faster than it should be. It almost sounds like a turbo whining. It doesn't seem right.
3 Answers
  • HouseCallAuto
    HouseCallAuto 10/3/2012
    The fan clutch might be seized and is spinning at full engine rpm instead of "slipping" as it is designed to do. The fan should increase it's speed with rpm and / or temperature. If the fan is spinning at full engine rpm the engine will sound like a jet engine and you will have a power loss as well, feeling hesitation.
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    HouseCallAuto
    Tom Cardosa 10/3/2012
    That is exactly what it sounds like. Not sure about the power loss or hesitation. How should I proceed. Car runs. Am I doing any harm operating this way.? Lifted up the hood at idle and the fan was going supper fast.
  • HouseCallAuto
    HouseCallAuto 10/3/2012
    Raise the hood, leave the engine off and reach down and see if you can rotate the fan easily. It should feel resistance to turning, will feel hydraulic feeling, tight but able to turn with your filgers, but you should not be able to make it freewheel. If you can't turn it then it is seized.
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    HouseCallAuto
    Tom Cardosa 10/5/2012
    Yes the fan does freewheel by turning it with my fingers. Ran car a short distance and the overheating warning light came on and car began to slow down. Pulled over and stopped. Brought the car back home after a few hours where it still sits. What do you think? Thank you for your help.
  • HouseCallAuto
    HouseCallAuto 10/5/2012
    I think this car needs a look by a professional. The cooling fan may be operating at top speed to cool off the engine which is overheating for another reason. A bad water pump is not uncommon on this car and the water pump is electric.
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    HouseCallAuto
    Tom Cardosa 10/7/2012
    Thank You
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