Aux Fan not jumping

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  • cganne
    Advanced Member
    • Jan 2010
    • 103

    #1

    Aux Fan not jumping

    I've tried jumping the green/black wire with the black with no luck, checked fuse 17, 18, 19 and I believe 3 and all fuses are good. Where would be my next step to diagnose the problem?
  • Ceeker
    R3VLimited
    • Sep 2009
    • 2821

    #2
    I believe the green/black is the fan speed wire. I would first put direct power to the fan from a battery source. To make sure it is actually getting power and the motor is still good. chances are you're fan resistor is just blown. Common problem.
    sigpic

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    • cganne
      Advanced Member
      • Jan 2010
      • 103

      #3
      What is the easiest way to access the fan directly?

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      • StereoInstaller1
        GAS
        • Jul 2004
        • 22679

        #4
        Pull the grilles

        Closing SOON!
        "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

        Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

        Thanks for 10 years of fun!

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        • cganne
          Advanced Member
          • Jan 2010
          • 103

          #5
          Originally posted by StereoInstaller1
          Pull the grilles
          Thanks

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          • Ceeker
            R3VLimited
            • Sep 2009
            • 2821

            #6
            you will see either a silver color bar with two wires going into it held on by two screws. This is your resister. Or it could be a finned black bar with the same two wires. The screws are usually difficult to remove especially with the black resistor. I would turn the screw clockwise first a bit just to break any corrosion and then remove the screws holding the resistor in -if this is the issue you are having with your problem. :-)
            sigpic

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            • Disco Benny
              Advanced Member
              • Aug 2011
              • 123

              #7
              Would a blown resistor cause the fan NOT to turn on?

              I tested the normal and high speed fans, they BOTH work when I touch the wires together but my normal fan does not turn on when the AC button is on

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              • immajackuup
                E30 Enthusiast
                • Dec 2010
                • 1132

                #8
                Originally posted by Disco Benny
                Would a blown resistor cause the fan NOT to turn on?

                I tested the normal and high speed fans, they BOTH work when I touch the wires together but my normal fan does not turn on when the AC button is on
                I assume that's a relay problem.

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