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Hi Steve. The radiator fan on my AUDI A6 moves but you can stop it by hand and move it in any direction. Could this be the viscous coupling needs replacing?

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  • Audi Master
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The fan has a 'heat activated 'clutch' the more heat the more the fan 'locks' in and forces air over the radiator - thus cooling the water flowing through it.
So - replace the fan clutch available at all parts houses for under 50.00 USD
Pull the batter
- remove the water pump belt -
you may want to remove the radiator for clearance - careful the radiator can cut you deeply if you're not protected so wear good gloves.

Posted on Jul 09, 2010

  • Gary Rice
    Gary Rice Jul 09, 2010

    The fan has a 'heat activated 'clutch' the more heat the more the fan
    'locks' in and forces air over the radiator - thus cooling the water
    flowing through it.

    So - replace the fan clutch available at all parts houses for under
    50.00 USD

    Pull the battery

    - remove the water pump belt -

    you may want to remove the radiator for clearance - careful the
    radiator can cut you deeply if you're not protected so wear good gloves.

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  • Audi Master
  • 6,826 Answers

Yes, if you have a belt driven fan then the clutch allows the fan to move sort of slide. But, if there is not enough 'resistance' to turning, then it won't cool the engine that effectively.

The viscous fan clutch or coupling can wear out over time.

The viscous coupling is a safety feature in case you get something caught there it won't cut or sever anything as badly. Still, I would keep my hands away from a turning fan blade.

If the car doesn't overheat, I wouldn't worry too much about it, though.

(If you have an electric fan, however, it usually just is connected to tan electric motor directly)

Posted on Jul 09, 2010

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