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Thread: A/C / Heater Blower Switch

  1. #1
    Join Date
    Aug 2005
    Location
    Henderson,NV
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    4
    My Cars
    1999 2.3 Z3 Alpine White, 2004 4Runner SR5 4x4

    A/C / Heater Blower Switch

    We have a 1999 Z3 2.3L and we love the car.

    Problem we've been having:

    Fan blower control switch on the control panel - fan only blows on high. Does anyone know what may cause this and what the solution would be? Last week it did the same thing then i fiddled with it a bit then it worked again. Then it went out the other day.

    Since it blows on high I thought maybe it would be a faulty switch, not the fan motor. Could it be a blown fuse? I hope that's all it is.

  2. #2
    Join Date
    Nov 2002
    Location
    Minneapolis, MN
    Posts
    275
    Quote Originally Posted by pdw1970
    We have a 1999 Z3 2.3L and we love the car.

    Problem we've been having:

    Fan blower control switch on the control panel - fan only blows on high. Does anyone know what may cause this and what the solution would be? Last week it did the same thing then i fiddled with it a bit then it worked again. Then it went out the other day.

    Since it blows on high I thought maybe it would be a faulty switch, not the fan motor. Could it be a blown fuse? I hope that's all it is.
    It's a common problem with the blower resistor pack on the Z3s. You can try cleaning the resistor. More info in this thread. Good luck.

    http://forums.bimmerforums.com/forum...d.php?t=327242

  3. #3
    Join Date
    Jan 2002
    Location
    Québec City
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    21,084
    My Cars
    '14 GLK250, '13 Abarth
    Quote Originally Posted by pdw1970
    We have a 1999 Z3 2.3L and we love the car.
    You will until you actually try to mod it.

    1999 Cosmos Black/Dove Grey BMW ///M3 convertible - 5 speed - SOLD

    2005 Atlantic Blue Pearl/Taupe Leather Subaru Legacy 2.5 GT Wagon - 5 speed
    - SOLD

    2014 Tenorite Grey/Black Mercedes-Benz GLK 250 - bone stock.

    2013 Bianco/Rosso Abarth 500c - 5 speed

    2016 Oxford White/Grey Ford Transit 250 Powerstroke 148 MR (DIY RV conversion)

  4. #4
    Join Date
    Aug 2005
    Location
    Henderson,NV
    Posts
    4
    My Cars
    1999 2.3 Z3 Alpine White, 2004 4Runner SR5 4x4
    I'll give it a try this weekend - your knowledge is much appreciated

  5. #5
    Join Date
    Dec 2003
    Location
    Northern Va
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    11,565
    My Cars
    E36/8, K12R, E91
    Good luck! Welcome!
    2002 Alpine White w/ Black 368 (<OO \(||][||)/ OO>)
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  6. #6
    Join Date
    Feb 2006
    Location
    Easton, CT USA
    Posts
    9
    My Cars
    1986 BMW 535i

    Fan blower

    Quote Originally Posted by pdw1970
    We have a 1999 Z3 2.3L and we love the car.

    Problem we've been having:

    Fan blower control switch on the control panel - fan only blows on high. Does anyone know what may cause this and what the solution would be? Last week it did the same thing then i fiddled with it a bit then it worked again. Then it went out the other day.

    Since it blows on high I thought maybe it would be a faulty switch, not the fan motor. Could it be a blown fuse? I hope that's all it is.
    I just read about the electrical system last night trying to fix a similar problem in my 1986 535i. When set on high, the fan blower switch gets direct battery current 12v dc. So, if it works on high, there is nothing wrong with your blower motor. Settings below the high setting pass through a resistor pack, reducing current for the lower fan settings. So, you probably have either a bad resistor pack, or faulty wiring through the risistors. Good luck!

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