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Hissing noise

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

  1. B5 BIKER

    B5 BIKER Member

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    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
     
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  3. gtiboy

    gtiboy Member

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    Yep i believe its normal pal mine does it .
    Its happens when you have had the air con on .
     
  4. wesmaster

    wesmaster Member

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    yep mine does it too, just the low and high pressure sides of system equalling out.
     
  5. B5 BIKER

    B5 BIKER Member

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    Ok thanks, will turn it off and see if it happens the next time.
    cheers
     

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