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my air con makes a hissing noise-does yours

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by swarcup, Jul 7, 2010.

  1. swarcup

    swarcup Well-Known Member

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    as the title suggests my aircon hisses.

    it happens under the bonnet, the engine is an ake 2.5v6tdi 180 and to the left hand side as you face the engine(drivers side) there are 2 refrigerent pipes, They pass through the plenum chamber wall and disapear under the brake servo, there are two black screw caps on these pipes (1 on each). this is the area that hisses, you can hear it after the engine is turned off, it lasts for about 10 secs.

    My question is is this a pressure relef thing or is something amiss?

    seems to work ok, and no econ light on
     
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  3. 4Rings4Eva

    4Rings4Eva New Member

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    This is normal mate. Mine does the same thing :)
     
  4. swarcup

    swarcup Well-Known Member

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    thanks mate. its always a relief when you think somethings wrong and it turns out to be normal
     
  5. chrisash32

    chrisash32 Member

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    mine too :)
     
  6. 4Rings4Eva

    4Rings4Eva New Member

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    No probs mate....Glad to have put your mind at rest...:)
     
  7. jwb7

    jwb7 New Member

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    Hi mate
    my a4 tdi that i just got does the same, i took it to the garage to be looked at and he said it's normal on most Audi's
     
  8. iyrix

    iyrix Member

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    this might not be normal, this could be due to running low on gas. Mine was doing this the other day, had it drained and moisture removed - regased and perfect!

    Just my thoughts...
     
  9. jdp1962

    jdp1962 Grumpy Old Moderator
    Staff Member Moderator Audi S4

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    Indeed; I'll always remember the first time I saw a puddle of water under my first air-con equipped car on a hot day.
     
  10. swarcup

    swarcup Well-Known Member

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    same here thought i had a fluid leak
     

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