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Thread: Insanely loud aux fan normal?

  1. #1
    Join Date
    Mar 2018
    Location
    Bella Vista, Ar
    Posts
    274
    My Cars
    2001 BMW 740iL

    Insanely loud aux fan normal?

    So it's been a hot summer. That means A/C is always on. So hot my A/C cycles, I think due to the "I'm too hot so I'm going to shut down your A/C for a minute in this insane 107 degree heat" switch. On a side note, can that be programmed out?? Or raised??

    Anyway, my aux fan is loud.... Like LOUD loud. As in, I could hear it inside a gas station at the register when the stores doors were closed. So loud people seem to get nervous walking past it. So loud my kids cover their ears when it's on.

    And it's air noise, not motor or anything. Are these things just insane high RPM electric motors??

    If this is not normal, should I look for blockages?? Is some regular shot?? What say the great and powerful Wizards of E38?

    Sent from my SM-G965U using Tapatalk
    2001 740iL "Silver Beauty"
    1986 Porsche 951 "Silver Bullet"
    1987 Porsche 944 NA Auto (rebuilding for my son's first car)
    https://home.doonze.net/filepage.php <- BMW/Porsche doc's and files, work in progress

  2. #2
    Join Date
    Mar 2013
    Location
    Sonora, ca
    Posts
    706
    My Cars
    2001 740il
    Normal. Mine sounds like a small plane taking off. It should slow down when car is off.

  3. #3
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    Check the condition of the fan clutch, when they are worn out the electric fan has to work harder

  4. #4
    Join Date
    Nov 2016
    Location
    NY
    Posts
    2,665
    My Cars
    750IL/540iT/R53/E46Vert
    Also look at the fan blades for damage. If it is unbalanced, it could get very noisy.

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