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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
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    swarcup Well-Known Member

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    [Jul 7, 2010]
    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
    #1
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  3. 4Rings4Eva
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    4Rings4Eva New Member

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    [Jul 7, 2010]
    This is normal mate. Mine does the same thing :)
    #2
  4. swarcup
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    swarcup Well-Known Member

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    [Jul 7, 2010]
    thanks mate. its always a relief when you think somethings wrong and it turns out to be normal
    #3
  5. chrisash32
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    chrisash32 Member

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  6. 4Rings4Eva
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    4Rings4Eva New Member

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    [Jul 8, 2010]
    No probs mate....Glad to have put your mind at rest...:)
    #5
  7. jwb7
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    jwb7 New Member

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    [Jul 27, 2010]
    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
    #6
  8. iyrix
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    iyrix Member

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    [Jul 27, 2010]
    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...
    #7
  9. jdp1962
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    jdp1962 Grumpy Old Moderator Staff Member Moderator

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    [Jul 30, 2010]
    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.
    #8
  10. swarcup
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    swarcup Well-Known Member

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    [Jul 30, 2010]
    same here thought i had a fluid leak
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