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Thread: Blower fan problems persist!

  1. #1
    Join Date
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    1989 e32 750il,1995 525i

    Blower fan problems persist!

    The plot thickens with my blower fan issue. I read in a previous post that I should test for power at the resistor plug to see if my fan switch is working properly. I got power at all 4 pins simultaneously no matter what position the switch was in accept for off. I got 12v At every pin at the same time no matter the position of the switch with the exception of off position which it was 0v. Im by no means an electrical expert but according to the diagram each pin should only have power when switch is in respective position. Or am I missing something?

  2. #2
    Join Date
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    1989 e32 750il,1995 525i
    Update: I believe it’s the switch. I hooked the old fan back up and disassembled the heater control panel to get to the switch. With the switch out and plugged into the harness for test i was able to turn switch in various positions and apply pressure to the copper “tangs” with a small flat blade . All speeds worked on fan when applying pressure to the switch tangs accessible through slots in the side of housing. So im going to go with it wasn’t the resistor or the fan itself but is the switch. Of course the most expensive and hardest to find out of all three parts.
    Last edited by Helloball; 11-24-2022 at 07:01 PM.

  3. #3
    moroza's Avatar
    moroza is offline MORΩN ΛABIA BMW CCA Member
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