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Thread: Climate Control Fan Speed Not Working Correctly

  1. #1
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    Climate Control Fan Speed Not Working Correctly

    The fan speed control knob isn't working properly. Only the highest fan setting works. No other fan speeds work. Please tell me I don't need to replace the entire climate control unit to fix this issue...

  2. #2
    DSC Off StuM's Avatar
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    Did you ever figure this issue out and get it corrected? I have the same issue, but only intermittently. Thanks,
    StuM
    2006 FORD GT
    Various Porscheís, Bimmers, Astonís, classics, Superformance...
    2013 M3 Lime Rock Edition coupe (sold)
    2011 Audi R8 V10 Spyder (sold)
    1967 Corvette 427 roadster (sold)
    2013 Maser MC convt (sold)
    2014 BMW i8 (sold)
    2017 Audi R8 Plus coupe (sold)
    2017 FORD Raptor Screw
    2019 Rubicon
    2002 Z8 (2)
    2001 Z8
    2019 911 Turbo S
    1968 Nova SS

  3. #3
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    Weíre pretty sure itís the resistor for the fan. Very common issue on other models as well. The highest setting for the fan works because itís a straight shot from the switch to the fan without going through the resistor. Mine was working intermittently as well. Havenít installed the new resistor as mine is working at the moment and my mechanic has a bunch of my other projects that are more of a priority at the moment.

  4. #4
    The symptoms you describe sound very much like a failing Final Stage Resistor, often referred to as a "hedge hog" due to its spikey appearance. These are known to fail quite regularly in contemporaneous E39 and E46 BMW's, so it is highly likely the cause. I replaced one in my son's 2001 330ci a number of years ago, it is a fiddly job up under the dashboard, I have no idea how inaccessible it might be on the Z8.

    https://www.youtube.com/watch?v=7_D-Ki_Kk2k

  5. #5
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    HVAC fan switch resistor replacement process?

    Quote Originally Posted by boomster View Post
    The symptoms you describe sound very much like a failing Final Stage Resistor, often referred to as a "hedge hog" due to its spikey appearance. These are known to fail quite regularly in contemporaneous E39 and E46 BMW's, so it is highly likely the cause. I replaced one in my son's 2001 330ci a number of years ago, it is a fiddly job up under the dashboard, I have no idea how inaccessible it might be on the Z8.

    https://www.youtube.com/watch?v=7_D-Ki_Kk2k
    .......
    ....So, does anyone actually know where this resistor resides and the actual replacement procedure? Seems it vastly differs on the many BMW model lines.
    Thanks,
    StuM
    2006 FORD GT
    Various Porscheís, Bimmers, Astonís, classics, Superformance...
    2013 M3 Lime Rock Edition coupe (sold)
    2011 Audi R8 V10 Spyder (sold)
    1967 Corvette 427 roadster (sold)
    2013 Maser MC convt (sold)
    2014 BMW i8 (sold)
    2017 Audi R8 Plus coupe (sold)
    2017 FORD Raptor Screw
    2019 Rubicon
    2002 Z8 (2)
    2001 Z8
    2019 911 Turbo S
    1968 Nova SS

  6. #6
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    My mechanic was a master technician for bmw and has a physical copy of the Z8 workshop manual. Iíll ask him to bring it to the shop and see if thereís directions on how to get to it. Iíll report back when he brings it.

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