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heater fan not working

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  • heater fan not working

    hi all
    i need some help
    recently my fan stopped working on all 4 settings
    i checked the fuses and couldnt locate the problem
    then i pulled the dash trim and checked for power to the fan...nothing
    i then pulled the 4 way switch and found no power to posn 1 ....my wire is black and brown where the wiring diagram shows blue and black
    the diagram then shows SF56 a 40amp fuse at holder F....also blue and black wire

    well i found a 40amp fuse under the pass seat,but the wires are red and red/yellow....no power on either wire

    all checks done ignition ON but eng not running

    im at a loss from here

    the aircon light comes on as does the recirc flap(flap works too)

    my next step is ross-tech but not sure if ill do any good with that for this prob

    any advise/help gratefully accepted

    russ
    Last edited by merlot; 21-06-2019, 08:45 AM.

  • #2
    Don,t bother with any other search here is what you need , takes about 15 minutes to fit Heater Blower Fan Resistor Motor For VW T5 Transporter Touareg Amarok 7E0959263C 1176020000012 | eBay
    I have done two of these in mine and mates van and yes they both had the same issue as yours.

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    • #3
      Originally posted by Sunny43.5 View Post
      Don,t bother with any other search here is what you need , takes about 15 minutes to fit Heater Blower Fan Resistor Motor For VW T5 Transporter Touareg Amarok 7E0959263C 1176020000012 | eBay
      I have done two of these in mine and mates van and yes they both had the same issue as yours.
      thanks for reply Sunny
      i took the resistor from my T6 wreck(bitch of a position)and tried it in the T5 but it made no difference

      i need to find the loss of power to SF56 fuse
      because the wiring is so heavy going to this fuse,im thinking there must be a relay somewhere pulling it in

      the only relays ive seen are under the battery tray

      ill try there on monday

      russ

      Comment


      • #4
        just an update to power loss at blower switch

        i was always going to swap out the BCM as i have a later model one which supports MF steering wheel lighting

        after swapping the BCM,the power came back to the fan

        unfortunately,now i have no power windows and only one page on the instrument panel(distance to empty)



        im hopeless with Ross Tech and its telling me ..coding incorrect to the module

        perhaps it thinks its winter and the windows need to stay closed

        i dont understand why these things need to be this complicated..there are literally thousands of wires in this van

        anyway,back to the BCM.....i think it lost a pathway as power loss was sudden

        russ

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        • #5
          well i finally got a result after chasing wires all week

          the relay for the blower fan is behind the BCM........the trigger wire(brown with red stripe) coming from the BCM to the relay was dead
          so i piggybacked trigger from the adjacent relay(the 2 relays are numbered 100) and now the thing is back to normal
          pity i couldnt use the later BCM but chasing window winder not working was just not going to happen

          van is T5 2010

          russ

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