505 Viscous coupling fan
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  1. #1
    Fellow Frogger!
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    Icon7 505 Viscous coupling fan

    As some may know, the cost of a replacement viscous coupling hub for the 505 STI / GTI radiator fan is mind-blowing. It seems no change from $600 is to be expected.

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    Has anybody found a cheaper non-genuine source?

    Otherwise, the alternative seems to be to replace the unit with a large thermatic fan, powered via the radiator thermo-switch and a relay. Anybody running this set-up, and if so, what efficiency are you getting in summer in regard to keeping normal engine temperatures?

    Cheers,
    Kim.

  2. #2
    Fellow Frogger! jarrods's Avatar
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    Default

    Check out this thread and your question should be answered


    505 Viscous Fan

    Jarrod

  3. #3
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    Icon7

    Hi Jarrod,

    Many thanks for the thread lead.

    Seems to be equally divided opinions between using a second hand or Volvo type, or replacing with a thermatic fan.

    A bit more research needed I think.

    Cheers,
    Kim.

  4. #4
    1000+ Posts robmac's Avatar
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    Default Thermo Fan

    Quote Originally Posted by KIMDEB
    Hi Jarrod,

    Many thanks for the thread lead.

    Seems to be equally divided opinions between using a second hand or Volvo type, or replacing with a thermatic fan.

    A bit more research needed I think.

    Cheers,
    Kim.
    Hi Kim,

    Suggest you don't buy from Davies Craig thru a retailer.

    Suggest you go a wreckers and find a Holden or Falcon 6 cyl or V8 fan - cheaper initially and cheaper to replace.

    The 505 have some nice lugs on the radiator which allow brackets to made up easily. On my 404 I put the fan on the engine bay side of the 505 radiator which meant that fan had to draw air thru it mounting side.

    When you choose a fan remember it is you need to make sure you can mount fan drawing air - you can't simply reverse the direction of the fan.
    Burt sometimes you can reverse the blades and acheive the same result.

    You will need a relay with the coil controlled by the the pug thermo switch -bear in mind these fans draw quite a few amp (somtimes 20 or more) so 8mm
    square cable and direct runs to the battery/solenoid are in order.


    regards Rob

  5. #5
    Fellow Frogger! 604 tragic's Avatar
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    Default

    Quote Originally Posted by KIMDEB
    As some may know, the cost of a replacement viscous coupling hub for the 505 STI / GTI radiator fan is mind-blowing. It seems no change from $600 is to be expected.

    Has anybody found a cheaper non-genuine source?

    Otherwise, the alternative seems to be to replace the unit with a large thermatic fan, powered via the radiator thermo-switch and a relay. Anybody running this set-up, and if so, what efficiency are you getting in summer in regard to keeping normal engine temperatures?

    Cheers,
    Kim.
    Kim
    1/ These viscous fan hubs can be fixed cheaply see:

    http://www.landsharkoz.com/tt/ttvfc.htm

    2/ But if you want an electric replacement check out the SAAB 900 set up at a wreckers (Saab parts incl. fans should be dirt cheap) Saab 900 has 2 side by side - for normal & aircond, plus a radiator temp switch, plus a relay set-up (labeled in the fuse box).
    So many projects - so little time.

  6. #6
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    Icon7

    Thanks 604 & Rob,

    Am currently investigating those options. Meanwhile, have just had the alternator fail on the GTI, so am attending to that before I go further. Its the first time for this fault, so cannot complain.

    Regards,

    Kim.

  7. #7
    1000+ Posts robmac's Avatar
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    Default Alternators

    Quote Originally Posted by KIMDEB
    Thanks 604 & Rob,

    Am currently investigating those options. Meanwhile, have just had the alternator fail on the GTI, so am attending to that before I go further. Its the first time for this fault, so cannot complain.

    Regards,

    Kim.


    Kim,


    As you have rear Iam an advocate of dispensing with any French electrical item.


    I have posted quite a few threads about modifying Holden/ Falcon. Mitsubishi alternator which are very cheap and easy to get - also cheap parts.

    I offer this for your consideration instead of perserving with a Ducellier or Paris Rhone which are shite.

    regards


    Rob

  8. #8
    Fellow Frogger! 604 tragic's Avatar
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    Default

    Quote Originally Posted by robmac
    Kim,


    As you have rear Iam an advocate of dispensing with any French electrical item.

    have posted quite a few threads about modifying Holden/ Falcon. Mitsubishi alternator which are very cheap and easy to get - also cheap parts.

    I offer this for your consideration instead of perserving with a Ducellier or Paris Rhone which are shite.
    Rob
    Yes - I agree STI alternators were crap from day 1 !
    They had a faulty ???? which meant that they didnt charge properly
    So many projects - so little time.

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