1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Aircon moisture buildup query

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by Andi25th, Jul 8, 2012.

  1. Andi25th
    Offline

    Andi25th Member

    Joined:
    May 14, 2010
    Messages:
    226
    Likes Received:
    16
    [Jul 8, 2012]
    I've got a water leak in the cabin.

    On Thursday my passengers floor mat had water droplets all over it. Not thinking to much about it I dryed it off and carried on.

    Yesterday the same thing happened.

    The weather has been close but very wet up here in Scotland. I've had the aircon on flat out for 3 days at 18c or at LOW position.

    So today I stripped the glove box out and noticed water dripping from the blower motor. Removed the motor expecting to see water coming from the pollen filter housing. But nothing wet further up. It seems to be within the blower motor assembly.

    Could it be possible that the cold aircon air is creating that much condensation / moisture ?
    Has anyone else experienced this ?

    Cheers
    Andi.
    #1
  2. Ads

    Ads

    [Sep 16, 2014]

  3. APAutomotive
    Offline

    APAutomotive Shark Performance Shropshire

    Joined:
    Mar 7, 2012
    Messages:
    81
    Likes Received:
    3
  4. Andi25th
    Offline

    Andi25th Member

    Joined:
    May 14, 2010
    Messages:
    226
    Likes Received:
    16
    [Jul 8, 2012]
    I did suspect the pollen filter housing but it seemed dry above the motor. I've stripped, cleaned and sealed the pollen filter housing. It did seem a little damp around the seal.

    Hope that fixes it.
    #3
  5. APAutomotive
    Offline

    APAutomotive Shark Performance Shropshire

    Joined:
    Mar 7, 2012
    Messages:
    81
    Likes Received:
    3
    [Jul 8, 2012]
    make sure your plenum drain hole is free from debris aswell as this may cause water to build up causing all sorts of issues :icon_thumright:
    #4
  6. Andi25th
    Offline

    Andi25th Member

    Joined:
    May 14, 2010
    Messages:
    226
    Likes Received:
    16
    [Jul 8, 2012]
    The plugs were removed ages ago. So I can rule that one out.

    Just back from a run in the car and even more water dripped on to the mat.

    I'll remove the glove box and monitor it. As the bottom of the blower motor was soaking again.

    Hate water leaks.
    #5
  7. Ian-83
    Offline

    Ian-83 Member

    Joined:
    Apr 8, 2012
    Messages:
    202
    Likes Received:
    4
    [Jul 8, 2012]
    Check under the car with the AC on maximum cold to see if the heater box drain is ok.
    #6
  8. quattrojames
    Offline

    quattrojames Moderator Staff Member Moderator

    Joined:
    Mar 28, 2008
    Messages:
    13,888
    Likes Received:
    477
    [Jul 8, 2012]
    I agree, it sounds to me like the evaporator drain is blocked.
    #7
  9. APAutomotive
    Offline

    APAutomotive Shark Performance Shropshire

    Joined:
    Mar 7, 2012
    Messages:
    81
    Likes Received:
    3
    [Jul 8, 2012]
    As above, check heater box drain
    #8
  10. Andi25th
    Offline

    Andi25th Member

    Joined:
    May 14, 2010
    Messages:
    226
    Likes Received:
    16
    [Jul 8, 2012]
    Ok thanks lads. Will get it up on a ramp tomorro. Where is the drain located ?
    #9
  11. Andi25th
    Offline

    Andi25th Member

    Joined:
    May 14, 2010
    Messages:
    226
    Likes Received:
    16
    [Jul 8, 2012]
    Is this the top of the drain pipe ?

    [​IMG]
    #10
  12. quattrojames
    Offline

    quattrojames Moderator Staff Member Moderator

    Joined:
    Mar 28, 2008
    Messages:
    13,888
    Likes Received:
    477
    [Jul 8, 2012]
    Potentially, I'm not sure where it is to be honest.
    #11
  13. quattrojames
    Offline

    quattrojames Moderator Staff Member Moderator

    Joined:
    Mar 28, 2008
    Messages:
    13,888
    Likes Received:
    477
    [Jul 8, 2012]
    Elsawin's a bit vague, these may help:

    [​IMG]
    [​IMG]
    #12
  14. Andi25th
    Offline

    Andi25th Member

    Joined:
    May 14, 2010
    Messages:
    226
    Likes Received:
    16
    [Jul 8, 2012]
    Big thanks to all that's helped.

    The problem has now been resolved.

    The culprit was the Aircon drain pipe. It's very squashed as not to take up space. It was completely blocked up. I removed it washed it through and checked the valve at the end by blowing it through.

    Almost a pint of water and debris was removed in total.

    Thanks again to all that's contributed.
    #13
  15. quattrojames
    Offline

    quattrojames Moderator Staff Member Moderator

    Joined:
    Mar 28, 2008
    Messages:
    13,888
    Likes Received:
    477
    [Jul 8, 2012]
    This has been asked before, are you able to take a picture of where it is?
    #14
  16. BlackQuat
    Offline

    BlackQuat Well-Known Member VCDS Map User

    Joined:
    Nov 24, 2009
    Messages:
    1,800
    Likes Received:
    44
    [Jul 8, 2012]
    As per James post. Any heads up of how to do the job?
    #15
  17. Andi25th
    Offline

    Andi25th Member

    Joined:
    May 14, 2010
    Messages:
    226
    Likes Received:
    16
    [Jul 8, 2012]
    Remove glovebox and associated trim.
    Pull back carpet to reveal Aircon drain tube located to the right of the passengers footwell.
    The tube should look like this:
    [​IMG]
    Sorry about the quality of the picture, my flash died.
    Once you have located the drain tube. Remove by pulling from the bottom first. As my one was blocked to the top I got a jug ready to catch the liquid when removing the tube from the top.
    Once removed clean tube thoroughly.
    When I refitted the tube I fitted it to the bottom first and blew through to check the lower valve was clear.
    I then switched the Aircon on to full cold which blew the rest of the remaining water out of the system. Refit tube to top hose and refit glove box etc.

    Hope that helps any further questions please ask via pm.
    #16
  18. quattrojames
    Offline

    quattrojames Moderator Staff Member Moderator

    Joined:
    Mar 28, 2008
    Messages:
    13,888
    Likes Received:
    477
    [Jul 8, 2012]
    Thanks, so it's easy enough to push it out through the bottom of the car again then?
    #17
  19. Andi25th
    Offline

    Andi25th Member

    Joined:
    May 14, 2010
    Messages:
    226
    Likes Received:
    16
    [Jul 8, 2012]
    The tube in the picture pushes in to a rubber grommet that's fixed in to the floor. So its easy enough just to pull it out and push it back in.
    #18

Share This Page