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water / condensation inside windscreen (B6 A4 S4)

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by lincoln_dj, Nov 23, 2012.

  1. lincoln_dj
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    lincoln_dj Member VCDS Map User

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    [Nov 23, 2012]
    Hi Guys,

    have had a quick search and can't find a great deal about this other than the usual blocked pollen filter & blocked battery drain holes.

    Just wondered if either of those would cause the amount of water on my screen? It took a good 12-13 minutes to clear this morning with full blowers, ac on, etc. Can see this water freezing in the not-so-distant future. I'm loathe to wipe it off as you then get wipe marks until you clean the window properly...

    So just wondering if this is as bad as other peoples and if so, did changing pollen filter or anything else cure it?

    No comments from idiots telling me theirs is fine please - not had this issue in the last 14 years of driving so it's definitely the car and not how i drive or use the hvac!!! :)

    pic... [​IMG]
    #1
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  3. kite
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    kite Member VCDS Map User

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    [Nov 23, 2012]
    Is it blowing on to the screen, looking at the picture I would expect the centre to clear first.
    I had this with mine and the air distribution flap motors was stuck.
    Think there's a how to on here somewhere to free up the motor.
    #2
  4. blyths24
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    blyths24 Member

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    [Nov 23, 2012]
    I have the exact same issue my friend...

    Awaiting to see if anyone replies with some good advice/tips :)
    #3
  5. lincoln_dj
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    lincoln_dj Member VCDS Map User

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    [Nov 23, 2012]
    this is when I first come out to the car in a morning. if fully steamed up the centre does clear first as expected. Makes me wonder if the moisture lives under the centre vents somewhere... Air definitely comes out the centre vents.
    #4
  6. Wahlstrom
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    Wahlstrom Member

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    [Nov 23, 2012]
    Drain holes blocked for sure.. Replace filter as well..
    #5
  7. Mike.M
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    Mike.M Well-Known Member

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    [Nov 23, 2012]
    I had this and so did my wifes mk5 Golf.

    Changed the pollen filters in both and the problem disappeared completely. I was amazed at how clogged they were with mouldy green/grey stuff and could not have been changed in a while
    #6
  8. Mike.M
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    Mike.M Well-Known Member

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    [Nov 23, 2012]
    Also is there water in the chamber below the car battery? If so make sure he rubber plugs are taken out so the water can drain out as they block all the time.
    #7
  9. lincoln_dj
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    lincoln_dj Member VCDS Map User

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    [Nov 23, 2012]
    thanks guys i'll check near the battery. also getting oil n filter change next weekend so i'll get pollen filter too.

    wahlstrom - which drain holes do I need to be checking?

    All carpets etc are dry, although when I open rear offside door there is a little water on the sill plate (where the S4 ally plate is)
    #8
  10. Jp-tqs
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    Jp-tqs Member

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    [Nov 23, 2012]
    Had a similar problem on my b5, the bulkhead where the battery sits was about 3" deep in water! Battery out, stab around with a screw driver till you find a drain hole and unblock. It will all gush out under your car and form a big puddle!
    I have similar issues with my rear window at the moment, very annoying first thing in the morning.
    #9
  11. Wahlstrom
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    Wahlstrom Member

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    [Nov 23, 2012]
    Drainholes under battery(you have to remove it to get to it) and beside the ecu.. Remove the rubber in the hole.. I had the battery bay half filled with water.. Had no water at the pollen filter, but it was close....
    #10
  12. Mike.M
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    Mike.M Well-Known Member

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    [Nov 23, 2012]
    Audi and VW as the passat suffers the same now just remove the rubber grommets like what they did to mine. There was a revised part but that also suffers and they just take them out now.
    #11
  13. marktdisport
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    marktdisport Active Member

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    [Nov 23, 2012]
    Also check the ecu box the seals are also prown for leaking....
    #12
  14. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Nov 23, 2012]
    Confirm you mean the centre dashboard/windscreen vent and not the centre face vents? (The one that comes on when you press the front windscreen demist button).

    I'd check the evaporator drain is clear, if thats blocked then air will enter the HVAC system.
    #13
  15. Greeny233
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    Greeny233 Active Member

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    [Nov 23, 2012]
    get yourself a dehumidifier once you have drained the plenum chamber around the battery and checked for leeks. A friend of mine who is an auto electrician uses one for cars which have been letting water in and causing electrical faults. It'll stop the misting up and you'll be surprised how much moisture it collects.
    #14
  16. BlackQuat
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    BlackQuat Well-Known Member VCDS Map User

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    [Nov 23, 2012]
    Mines the same, but no blocked drains, no water in the car at all, hvac drain clear all good.
    #15
  17. Cabbyfan
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    Cabbyfan Member

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    [Nov 24, 2012]
    Check flaps on aircon system under the dash to see if the centre vent flaps are in the wrong place and google search audi a4 plenum chamber for grommets issue . Cost me a new brake cylinders on my last A4 that issue,
    #16
  18. Harribo66
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    Harribo66 Member

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    [Dec 1, 2012]
    Mine is worse then this! My full screen was covered and yesterday morning it had frozen on the inside. I had to do the dreaded thing of wiping it! :/. My pollen filter has been changed a week ago. And my plenum chamber is dry. And ideas?
    #17
  19. DALE_AVANT
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    DALE_AVANT Avantage

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    [Nov 5, 2013]
    It's that time of year again, come out from work and windscreen and passenger side windows all misted up
    #18
  20. A4sportMrT
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    A4sportMrT Member

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    [Nov 5, 2013]
    Same here, I'll be checking the points mentioned above. I had it very bad on the inside yesterday after work and would not bloody clear so I had to wipe it but a prompt visit to tesco for some screen wipes. I thought it was because I fitted wind deflectors on Sunday.
    #19
  21. Mike.M
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    Mike.M Well-Known Member

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    [Nov 6, 2013]
    An old pollen filter is the main cause of this.
    #20
  22. A4sportMrT
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    A4sportMrT Member

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    [Nov 6, 2013]
    How do you get to it?
    #21
  23. Mike.M
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    Mike.M Well-Known Member

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    [Nov 6, 2013]
    It's near the battery
    #22

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