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Whirring noise when I switch of the engine- any ideas?

Discussion in 'A3/S3/Sportback (8P Chassis)' started by Newquaygreen, Oct 22, 2013.

  1. Newquaygreen
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    Newquaygreen New Member

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    [Oct 22, 2013]
    I have an A3 S-line 54 plate
    When i switch off the engine there is a whirring noise like a fan slowing down, doesen't do it al of the time but more often than not
    Any ideas on what it is and should I be worried?
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  3. Geraldy212
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    Geraldy212 Sportback owner

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    [Oct 22, 2013]
    Could it indeed be the fan(s)? I believe that the engine fan runs most of the time, and the aircon fan runs when the aircon is in use. When I switch off my A3, there is the noise of either one fan or both fans spooling down. To check on this, open the bonnet before switching off, and get someone to switch it off while you are looking into the engine compartment. I guess if the engine is not hot enough, then no fans will be running, and thus no noise. So depending on engine temperature and aircon on/off, there will be a difference in the noise when switching off. At least that is what I have observed
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