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Plenum chamber drain holes

jdp1962 Oct 29, 2020

  1. jdp1962

    jdp1962 Grumpy Old Man

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    As the weather cools and we head into autumn, I'm starting to see condensation build up on the inside of the windscreen. That's usually an indicator that the plenum drain holes need clearing; I can do the nearside one pretty easily but how does a sausage-fingered idiot like me access the offside one that is concealed below so much fixed hardware? Does it need to go up on a ramp, have the engine undertray removed and a long stick poked up from below?
     
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  3. Simon

    Simon Registered User

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    can you get it with a jetwash lance?
     
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  4. jdp1962

    jdp1962 Grumpy Old Man

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    Possibly. :)
     
  5. Tatey14

    Tatey14 New Member

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    Have you got any damp carpets?

    I was wondering the exact same thing as after finding damp driver carpets with some heavy rain last weekend. Nearside drain seems find, but I can't even see the offside drain to know if it's blocked.

    Can't see any evidence of drips behind the A pillar trim, so can only think its coming through the bulkhead offside.
     
  6. rum4mo

    rum4mo Registered User

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    My B8 S4 is normally garaged so these drains never get chocked, though, as it ends up parked outside when away from home, I give these drains a checking over every other year, and I'm sure that I can reach the RHS one with something flexible, like a long "grabber" or "net curtain" springy thing that I've bought and used for years for jobs like this and threading through new wiring.
     
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  7. RyanJonS4

    RyanJonS4 Drive It Like You Stole It

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  8. jdp1962

    jdp1962 Grumpy Old Man

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    Well this morning I came up with the perfect solution; walking the dog this morning, I dropped in at my local indie, Sanspeed, and asked if they had any tips for doing it. The reply was "drop it in and we'll sort it on the spot". They did, free of charge. :)
     
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  9. Simon

    Simon Registered User

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    sounds like the best solution to me! where are they I'll drop mine down too :)
     
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  10. jdp1962

    jdp1962 Grumpy Old Man

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    Bexleyheath, Kent; bit of a trek for you. I'd invite you to drop in a cup for coffee but we're expecting to go into tier three any day. :weary:
     
  11. ld2130

    ld2130 Registered User

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    I currently have the same issue as my drive is surrounded by trees.
    I've just added gutter hedgehogs to my gutters and wondered if I could do something similar for the poor car as it just sitting there most of time these days.
     
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  13. audiwaterpump

    audiwaterpump Registered User

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    It would help if we knew the exact location of the drivers side drain hole.
    Any one got a diagram?
     
  14. rum4mo

    rum4mo Registered User

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    From memory, maybe not a good idea/servant, it is under the brake servo, which is why you can't see it easily.

    I have a "thing" about leaves etc gathering under car bonnets, as they can cause serious issues/costs if not removed frequently.
     
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  15. audiwaterpump

    audiwaterpump Registered User

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    Sometimes it feels like I own a British Leyland/Rover car.:coldsweat:
     
  16. jl-c

    jl-c Guest

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    don't know if this helps? Untitled.jpeg
     
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  17. audiwaterpump

    audiwaterpump Registered User

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    The drain hole on the driver's side is impossible to get to, without removing a lot of stuff.
    Does anyone where the water drains to? Does it drain into the engine bay, or somewhere else?
     
  18. rum4mo

    rum4mo Registered User

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    I'm sure, that both drains just drain through these holes+valves on the base of that plenum area down to the outside world below these points
     
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  19. audiwaterpump

    audiwaterpump Registered User

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    I was thinking, if we knew where the exit was then I may be able to clear the blockage form the bottom end as opposed to from the top end. - if that makes sense.

    The one of the passenger side drains into the engine bay.
     
  20. rum4mo

    rum4mo Registered User

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    I think that while that sounds like a good plan, in reality, even after removing a couple of under covers, that area, looking up from below, is a bit crowed gearbox /final drive wise.
     
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  21. audiwaterpump

    audiwaterpump Registered User

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    Pity that the driver's side one doesn't drain into the engine bay, like the passenger side one.
     
  22. Gooders

    Gooders Active Member VCDS Map User

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    I cleared mine out the other day using an air line and a hover lol. Blow the dirt up and the hover caught it all. Work rather well


    Sent from my iPhone using Tapatalk
     
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  23. quattrogone

    quattrogone Quattro Back!

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    Did mine a while ago, it was a regular compost heap in there!
     
  24. jdp1962

    jdp1962 Grumpy Old Man

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    But does it unbung the drain hole itself?
     
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  25. ld2130

    ld2130 Registered User

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  26. Gooders

    Gooders Active Member VCDS Map User

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    If you can get the angle right yes. Took a few try’s mind. This will of course depend how bad it is.


    Sent from my iPhone using Tapatalk
     
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  27. audiwaterpump

    audiwaterpump Registered User

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    Do you have a photo showing the stick/probe in the hole.
     
  28. Gooders

    Gooders Active Member VCDS Map User

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    No sorry


    Sent from my iPhone using Tapatalk
     
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  29. audiwaterpump

    audiwaterpump Registered User

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    If you get a chance, upload a photo on here, I'm sure it would help a lot of owners.
     
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