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Hissing noise

Discussion in 'A6/S6/Allroad forum (C5 Chassis)' started by B5 BIKER, Aug 15, 2013.

  1. B5 BIKER
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    B5 BIKER Member

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    [Aug 15, 2013]
    As the new owner of a 2003 2.5v6 tdi, I am finding my way.
    i have noticed when I park the car and turn off the ignition I can hear a 'hissing noise' from the engine bay.
    the noise seems to be coming from the area under the plenum chamber cover.
    i removed this but all I see is the air con filler connections, but it doesn't seem to be them.
    it only seems to last for 5-6 seconds approx.
    is this normal? Or is something leaking?
    is there a release of turbo gasses automatically after shutdown?
    any advice appreciated
    #1
  2. gtiboy
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    gtiboy Member

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    [Aug 16, 2013]
    Yep i believe its normal pal mine does it .
    Its happens when you have had the air con on .
    #2
  3. wesmaster
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    wesmaster Member

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    [Aug 16, 2013]
    yep mine does it too, just the low and high pressure sides of system equalling out.
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  4. B5 BIKER
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    B5 BIKER Member

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    [Aug 16, 2013]
    Ok thanks, will turn it off and see if it happens the next time.
    cheers
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