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Air noise coming from under bonnet audi a8 d2

\015 When turn engine off i can hear a hissing sound coming from under bonnet the end that meets the windscreen\015 Posted / edited by AnonymousUser on : 18-10-2021

Answers :

Sound is completely normal on all Audi's.
\012Your A8 uses an Orifice tube to regulate the pressure between the two halves of your air conditioning system. A hissing sound is normal after a shut down as the system equalises. Usually lasts about a minute and is more noticeable on warmer days.
\012Location on an A8 is on the very right hand side of the bonnet just under the windscreen - that's where the hissing will be coming from.
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