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Replacing the Fan Speed Resistor

Discussion in 'Holden Commodore How-To's' started by Infus10n, Mar 29, 2005.

  1. Infus10n

    Infus10n New Member

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    If your aircon only works on some fan levels (eg: 3 & 4 only) then you will need to replace your fan speed resistor. They cost about $54 from your local holden dealership. The job only takes 10-20 minutes depending on how confident you are.

    1. Pop the bonett
    2. Undo the bolts ontop of the wipers, lift wipers off (WD40 may be need as sometimes they are hard to get off, remember to mark where the wipers were because they need to be put back ni the same position otherwise they wont wipe the windscreen smoothly)
    3. Undo the black bolts under the wiper arms once they are lifted off.
    4. Pull off the rubber seal which is under the bonett (just before the black plastic cover where the wiper arms come out of)
    5. Remove the 5 little clips which are along the base of the windscreen (use a small screw driver to lift them up)
    6. Lift the black cover up but be careful as they crack easily
    7. Undo the 2 screws on the dome which is located towards the centre of the car
    8. Under the dome undo the other 2 screws which reveals the fan speed resistor, unplug it and put the new one in (you will notice one of the wires are broken on the old resistor)
    9. Do steps 2-8 in reverse.

    Hope htis helps because it helped me and now mine works. Thanx to several sources for helping me fix this so i tohught i'd type up a simple method to help others.
     
  2. Infus10n

    Infus10n New Member

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    Im not sure if this is for all models but its deffinantly for the VN - VS...
     
  3. jules

    jules we like the bun

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    $54 for a resistor??
     
  4. Infus10n

    Infus10n New Member

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    thats what i was charged... i got the reciept for proof.
     
  5. resistor....

    wow...that seeems a bit steep for 1 resistor...is it gold plated or something???loool...( just being cheekier than normal...you'll get used to me.....I did.....)...
    just rang Zupps in Mnt Gravatt....$51.00....... and he said yea, they are gold plated....loool.... :rofl:
     
    Last edited by a moderator: Apr 12, 2005
  6. Triox

    Triox New Member

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    If you are handy with a soldering iron, get hold of some resistance wire,
    Dick Smith has Nichrome and Cuprothal for about $3.00, and replace the faulty coil in the resistor pack , just wind your own coil,
    The length of the wire and the type of wire used will determine the fan speed,
    but I just had a try today first with a piece of copper wire and the only difference was speed 2 and 3 were the same.
    DO NOT use the copper wire long term as it can,t withstand the heat too well.

    If you have an old heater or kettle with exposed heating elements , you could
    probably use some of that too.
     
  7. thank, now my fan works. i gota vn n it the same thing.. so this applies from vn-vs models
     
  8. Infus10n

    Infus10n New Member

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    sure does.
     
  9. Madhouse_Dave

    Madhouse_Dave Crazy but Happy

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    Thanks from Me also I now have a fully working fan too..

    :king:
     
  10. Still doesn't work

    :unsure: i went to the holden dealer n i gotta replacement for my vn commodore fan resistor. i replaced it n still got the same problem. i noticed when i tried putting on the fan without the resitor only the 4th speed works but with the new resistor now its 3 and 4, no 1 and 2. my old resistor only worked on 3 and 4, i pretty much baught a $54 resistor for nothing, what else could it be? all my vents work, the blow motor thing works its only the speed 1 and 2
     
  11. Infus10n

    Infus10n New Member

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    did you check the wires on your old resistor before buying a new one?

    If one was broken its gotta be the resistor, if none were broken then its something else which i have no idea...
     
  12. kenwstr

    kenwstr New Member

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    Hi

    I just joined, wish I'd found this old thread earlier, spent almost a whole day tracing the wiring from the switch to locate this resister. Location not in my service manual. New resister now $62.80 from holden.

    Ok so the cuprothal wire from Dick Smith is $4 for 4 metres of 6 ohm/m 0.32 mm dia and the #2 elememt is 0.5 mm dia and around 24 cm long.
    The cold resistance looks about right but I'm not sure this finner dia will take the required current.

    Anyone know if the diameter is a problem?

    I intend adjusting the wire length until the speed settings have roughly even current steps. I have the gear and ability for this but little experience with elements where the resistance varies with temperature.

    I could double the 0.35 wire and this would give the same X area as the original 0.5 element. Would that work OK?

    Another option is to replace the element with a 7W cereamic resistor.
    opinions?

    It's a bit of effort but I'd feel ripped off paying $62 for the part.


    Regards,
    Ken
     
  13. MyVPIsFasterThanYourVP

    MyVPIsFasterThanYourVP New Member

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    If someone would please post the resistance values for all four positions on a working resistor block, it would then be possible to work out the required wattage, and then $1 or so per resistor instead of the bullsh!t holden $50-$60. Great thread,
    Colin
     
  14. 1991_Vn2nV

    1991_Vn2nV New Member

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    Could always visit a wreckers. I got a resistor for $5 from U Pull It.
     
  15. kenwstr

    kenwstr New Member

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    Hi,

    There seems to be an upgrade of the resister unit, my old one has 3 elements in a metal cage, the new one appears to have an aluminium heat sink from what I've seen. I did some testing but bear in mind that the no 2 element is blown so is only an estimate.


    #1 2.0 ohms
    #2 0.8 ohms
    #3 0.5 ohms
    #4 direct connection to fan

    Keep in mind that the elements are in series so the resistance on:

    1 is 2.0 + 0.8 + 0.5
    2 is 0.8 + 0.5
    3 is 0.5
    4 is zero

    Plus fan load of course.

    I used a amp meter but It had a blown resistor internally which was replaced. Since then the meter is probably not calibrated correctly and I think is reading high. My readings give:

    1 4 A
    2 11 A
    3 18 A
    4 25 A

    You can see an even incriment of 7A between settingsl. I would not recomment just working of a resistance value because this changes as the wire heats up so is difficult to predict accuratly from ohms law especially as the wire available is probably not a good match to the original. I'd recommend connecting an amp meter and adjust the connection point on the new wire until you are happy with the meter readings and fan speed on #1.
    Don't let the motor struggle to turn the fan. Only then form the that same length of wire into an element and solder it in.

    I ended up ordering a new resistor on ebay as there is no local supplier for resistance wire here. Dick Smiths postage charge is a killer on small items. The figures are estimates based on measurements but should give a rough guide to get you started.

    Best of luck,
    Ken
     
  16. MyVPIsFasterThanYourVP

    MyVPIsFasterThanYourVP New Member

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    it was you!

    so youre the bastard who stole my $13 eBay bargain.. then the next auction too for the $15 one LOL,
    Colin
    Oh and thanks for the values, I'm gonna try re-soldering the broken resistor, its broken right at one end, so ill soon see
     
  17. kenwstr

    kenwstr New Member

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    It Wasn't me honest :)

    or was it hmmmm?
    LOL


    Ken
     
  18. MyVPIsFasterThanYourVP

    MyVPIsFasterThanYourVP New Member

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    Will see how long my soldering lasts, all speeds working...... its so damn quiet on those first two speeds, like a secret club! Most people seem to only know the noisey group.
    Colin

    Lasted till 1/12/06, I got a spare from the wreckers so now we shall see how long it lasts!
     
    Last edited: Dec 1, 2006
  19. Bubbaj247

    Bubbaj247 VTR247

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    I got a vt replaced the fan resistor $22.50 and works a dream
     
  20. m3taL

    m3taL For what its worth.....

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    well blow me over backwards... i never would have worked thus out...

    so much money for so little wire.... might give the rebuild a go.
     

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