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Thread: e39 heat/ac fan turns off randomly

  1. #1
    Join Date
    Oct 2018
    Location
    Ramstein Germany
    Posts
    1
    My Cars
    2002 520i BMW

    e39 heat/ac fan turns off randomly

    Recently my 2002 520i has been dealing with the issue of my fan wanting to turn off. This car has the e39 heater control panel 6916655 installed which makes it a little unique. Early in the morning I normally have no issues but later in the day it won’t stay on for more than a few seconds. I just replaced the fan and the resistor. This car does not have a fuse that covers the fan. Should I drop $100 on a new switch or get a new battery or resistor again? What do you guys think?

  2. #2
    Join Date
    Jun 2002
    Location
    Aberdeen, NC (yes, again)
    Posts
    23,673
    My Cars
    E39M5, E500 4WD
    Did you buy an OEM final stage resistor, or a cheap Chinese thing? The Chinese ones are often bad, right out of the box.

    You certainly DO have fuses for this: If I picked the right wiring diagram, those are # 46 and #76. However, if the fan works sometimes, the fuse is a very unlikely culprit, and the Final Stage Resistor is most likely.

    Here are your wiring diagrams, etc:

    https://www.newtis.info/tisv2/a/en/

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, owner of German Motors of Aberdeen
    BMWCCA 274412
    German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471

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