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HELP. buzzing/wiering/humming noise on cold start up?

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by Bean5, Jan 6, 2013.

  1. Bean5
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    Bean5 kidney bean

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    [Jan 6, 2013]
    As above guys, been happebing for a couple of days, when I start my 2004 a4 1.8t
    I get a strange buzzing/humming noise, sounds a bit like when the fan kicks in after/on a lobg journey,

    had a look under the bonnet, and cant locate it to something specific, although it seems to be coming from the o/s

    I have checked my power steering levels, water/coolant levels, all are ok.

    So I went out this morning to film the noise on my phone and it didnt do it and It isnt particularly warm. Typical

    Can anyone help me. If I can find out what it is and replace/fix it im happy, just dont want to make it worse.

    Cheers
    #1
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  3. marktdisport
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    marktdisport Active Member

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    [Jan 6, 2013]
    Secondary air pump
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  4. Bean5
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    Bean5 kidney bean

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    [Jan 6, 2013]
    Big job? Expensive? Gonna get worse?/ok to drive?
    #3

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