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How to replace the blower brushes.

Discussion in 'A4/S4 forum(B5 Chassis)' started by ScottD3, Apr 18, 2011.

  1. ScottD3
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    ScottD3 I want your faulty electronics

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    [Apr 18, 2011]
    Simple little how to on replacing the brushes in your heater blower.


    Required parts:=-
    a set of new brushes.
    Heater Blower fan carbon brushes audi a4 80 avant a3 on eBay (end time 05-May-11 21:01:09 BST)

    Required Tools:=-
    8mm socket
    10mm socket
    Philips screw driver
    Flat blade screw driver
    Soldering iron
    Solder
    Solder sucker

    Pilers

    Step 1
    Locate the glove box.
    [​IMG]

    Step 2
    Remove the glove box
    [​IMG]

    Step 3
    Remove this air bag bracket to give you room. You can see the holes where it was at the top of the image. 4 10mm bolts
    [​IMG]

    Step 4
    Remove the 4 screws that holds the fan blower in place
    [​IMG]

    Step 5
    Remove the fan blower
    [​IMG]

    Step 6
    Remove the fan blower from its plastic housing. There is 3 black rubbery bits that holds the fan in to the larger plastic housing. Use the flat blade to gently push theses and release the fan.
    [​IMG]

    Step 7
    Locate the two old brushes. The clip that keeps the spring in looks lie it does in the picture. Just to the left of it is the contact point with solder that you need to unsolder and remove.
    [​IMG]
    Old brush Vs New brush
    [​IMG]

    Step 8

    Once the two brushes has been removed and the solder all cleaned up you're left with this
    [​IMG]

    Step 9
    Fit the new brushes, solder the cables and clip the springs back in.
    [​IMG]

    Step 10
    Put it all back together and enjoy a working fan.
    Last edited: Apr 18, 2011
    #1
    S4_dan likes this.
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  3. rossbrownlee
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    rossbrownlee Ross_S4

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    [Apr 20, 2011]
    Good Effort!
    I bought a new fan on fleabay and fitted that.
    Wish i'd searched a bit harder for brushes now....
    #2
  4. Grover2000
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    Grover2000 New Member

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    [May 21, 2011]
    An absolute superb writeup. I had a case of fan not working, checked fuse #25 30A which was OK. Then I checked the motor supply again this was fine and in conclusion together with this post I ordered the brushes from Egay £7 in order to replace them. They arrived in two days and replaced the brushes and hey presto I have a fully functional fan. Awesome.

    Thank you once again for the great post.

    Grover
    #3
  5. capt.midnite
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    capt.midnite New Member

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    [Nov 5, 2013]
    hi i have a 1998 audi a4 avant tdi , my problem is the heater fan doesnt work so im trying to remove the fan but it is different than the one in pic can any one tell me how to locate screws, please , ju
    #4
  6. ScottD3
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    ScottD3 I want your faulty electronics

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    [Nov 5, 2013]
    Same year as mine.

    Can you get a pic of it please?
    #5
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  7. capt.midnite
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    capt.midnite New Member

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    [Nov 5, 2013]
    hi scott thank you for your reply i just managed to do it there was 2 screws under the unit, so i streched the springs put it all back and it works , so will now order new brushes , thank you again for your reply wish you all the best , ju
    #6
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  8. jcb
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    jcb Active Member VCDS Map User

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    [Nov 6, 2013]
    think I have a spare on floating around if anyone is stuck (blower that is)
    #7
  9. foursprungdugtechnique
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    foursprungdugtechnique Member

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    [Dec 19, 2013]
    I replaced the brushes on my fan a few years ago, the commutators were a bit worn, and it started to fail again earlier this year. Went to the scrap yard and took a fan from a 1997 A4 and fitted that. £30 and no problems since.
    I would suggest checking the commutator (copper contacts on the shaft that the brushes contact) before doing the brushes, if they're dodgy they will eventually wear out.
    I got a couple of years out of the £4 brushes tho, so either way it's worth a go.
    #8

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