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Thread: Aux fan running at full speed always

  1. #1
    Join Date
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    Aux fan running at full speed always

    Bmw e39 98 523i manual with the 4 connector aux fan. After realising my issue for it not working being the temp switch, switched that and now the fan is in high speed(I assume, cause it is hella loud). What could be the problem for this? With the engine cooled and climates off, it still sounds like a jet plane

  2. #2
    Join Date
    Oct 2010
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    1997 BMW 540i 6 speed
    You have a circuit problem. Where did you buy the temperature switch?

    Also possible that the hi-temp relay is bad, and sticking.

    There are three relays: K21, in the E-box, runs the fan at 1250 RPM, whenever the A/C is switched on. K22, in the glovebox, runs the fan at 2000 RPM. K201, in the E-box, runs the fan at high speed (I don't know how high).
    Last edited by edjack; 05-22-2019 at 08:19 PM.


    Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.

  3. #3
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    1998 BMW 523i Sedan
    Quote Originally Posted by edjack View Post
    You have a circuit problem. Where did you buy the temperature switch?

    Also possible that the hi-temp relay is bad, and sticking.

    There are three relays: K21, in the E-box, runs the fan at 1250 RPM, whenever the A/C is switched on. K22, in the glovebox, runs the fan at 2000 RPM. K201, in the E-box, runs the fan at high speed (I don't know how high).
    I have checked the green relay on top of the ECU, in th engine compartment, I believe the high speed is supposed to be there aswell, black in color, just can't seem to find it? Photos show direct wire?..

  4. #4
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