(2.7TDi C6) Water in rear passenger side footwell. HELP!

[Lbcvantage]

Ive noticed the carpet in the rear passener side footwell is soaked. It seems to be isolated to the middle of the car (about where the rear mat clip is) in the corner of the rear seat and tunnel. Checked for windows open, boot etc but cant see where its coming from. Is there any AC gubbings in that area?
Any Ideas??

[Akash]

Ive noticed the carpet in the rear passener side footwell is soaked. It seems to be isolated to the middle of the car (about where the rear mat clip is) in the corner of the rear seat and tunnel. Checked for windows open, boot etc but cant see where its coming from. Is there any AC gubbings in that area?
Any Ideas??


You got an Avant or Saloon?
I know with the Avant's there has been issues with the rear washer liquid leaking and I also have heard about when a drain hole at the base of the windscreeen gets blocked which can cause it too

[Lbcvantage]

Sorry should have said its a saloon so no rear washer. Also it definatley doesnt have screenwash in the water in question.

[gupsterg]

Only a shot... have you checked to see if AC pollen/cabin filter is wet? if wet you may have drain blocked either on AC and/or plenum chamber in engine bay

[Lbcvantage]

Got home and pulled the plastic cover off to see if the drain hole under the windscreen was blocked. NS was blocked but there was no standing water. There is another under the servo I hear that I cant see or get to though. Not sure where the AC Pollen/cabin filter is to check. Where is the AC drain/plenum chamber.

[unstable]

I'm also interested in where these drains are as I think it might be the cause of my BT module issues. If someone could post pictures of the drains that we need to check that would be massively helpful, also what is the best method of getting the crap out/unblocking the drains?

Cheers

[Peter D]

Search on "Plenum Chamber" where are several "how to clear" guides on this. Regards Peter

[Lbcvantage]

Just found this on YouTube. Plenum Chamber Access 001 - YouTube (http://www.youtube.com/watch?v=HdihNzz0GHU) Can anyone confirm the 2.7 (battery in the boot) has just one drainage hole behind the plastic cover under the bonnet? I heard there was one under the servo but I cant see.

[Peter D]

There are two drains, and yes the one under the servo is difficult to see, You will need a good torch and a length of still wire. When you have pushed the debris our fluss the plenum chamber with a hose pipe then recheck the drains. Regards Peter

[Lbcvantage]

Thanks Peter. Thought that was the case... currently got the car running with bottom heaters on full to dry out but it looks like I will have to find a wire coat hanger and have a fiddle about. When I cleaned the NS one yesterday there was no standing water in there except in the drain itself so I'm hoping this is the problem.

[gupsterg]

If the drain is blocked in plenum chamber water can ingress into AC air intake... if drain on AC intake chamber is blocked, water will soak pollen filter and may then ingress to the interior...

18163

Above is image of pollen filter chamber being cleaned on filter change... it is from a LHD car... there is a piece of trim at end of glove box once removed you will see a cover clipped on to chamber for filter... the filter is a two part item... one is slotted in then pushed up then the other section is pushed in..

[Lbcvantage]

Found this which I presume is the best way to check if its wet? Cabin Air/pollen filter. Where is it on UK-spec car? (http://www.vwaudiforum.co.uk/forum/showthread.php?134809-Cabin-Air-pollen-filter-Where-is-it-on-UK-spec-car&highlight=pollen+filter+change)

[gupsterg]

Yep... that is best way... :)

The source that Chris highlight for info is a great thread... Link:- DIY 55k Service 2005 C6 - AudiWorld Forums (http://forums.audiworld.com/showthread.php?t=2760602)

[Lbcvantage]

Doesn't get any more comprehensive than that. Will get under the dash tonight and check for wetness within the filter area. Where does the AC drain from? Is it accessed from the same area or from outside the car?

[gupsterg]

AC fresh air intake chamber drain is in plenum chamber, it has its own hole to drain into transmission tunnel...

The condensate drains for AC are either side of transmission tunnel in interior compartment... IIRC you should be able to see the internal condensate drain pipes by removing the plastic trim either side of centre console, there is one screw at beginning of these trims behind a oval plastic cover once removed the trim just unclips from centre console...

[gupsterg]

Check your inbox :)

If you have found this info useful maybe a donation to the charity thread :)

If you click the glittery banner it will take you there...

[Lbcvantage]

Thanks once again. Car remains dry but it will have a date with the hose pipe this weekend for a water test.

[Lbcvantage]

Just discovered the floor is wet in the rear passenger footwell again. This is despite cleaning the drainholes under the windscreen. I'm now officially out of ideas! Could it be a door seal and how would I check?

[gupsterg]

Are the AC condensate drains either side of transmission ok?

[Lbcvantage]

I didn't check. The car had just been serviced and the garage said there was no sign of water in the air/pollen filter. Is it a simple job to check? What am I looking for?

[gupsterg]

The condensate drains for AC are either side of transmission tunnel in interior compartment... IIRC you should be able to see the internal condensate drain pipes by removing the plastic trim either side of centre console, there is one screw at beginning of these trims behind a oval plastic cover once removed the trim just unclips from centre console...

I think I sent you the relevant PDF.... I think I sent email from my other PC... not handy to check sent items in that one at mo... PM what titles of stuff I sent then will check what you may need...

[Lbcvantage]

Found those PDFs thanks. Will have a go this weekend.

[gupsterg]

Did you find your issue?

I've had repeat occurrence of fault on mine... water was seeping through chassis... filling box section under floor then seeping out of the rear footwell passenger side seals in floor...

View the "Link:- Victory... :) " posted here... Link:- The most Lemon Audi A6 Avant strikes again - Page 6 (http://www.vwaudiforum.co.uk/forum/showthread.php?139747-The-most-Lemon-Audi-A6-Avant-strikes-again&p=764257#post764257)

[Lbcvantage]

This is a lot to absorb.. Pardon the pun.
Did you ultimately find out what the problem was? Why was the box section under the floor filling with water and not draining off?

[gupsterg]

Why was the box section under the floor filling with water

There is an entry point in chassis which we could not find due to engine/engine parts blocking removal of heat shields...


and not draining off?

On box section there are several bungs out of them two have factory holes in to allow condensation draining/airing IMO... the holes are too small to allow draining of water... so in my case would flood interior...

The fix I'm going to do is seal inner section of floor... remove/make holes bigger in drain bungs on underside...

[Lbcvantage]

Given the amount of work you've put into this project can I run something by you which may be complete halfwittedness on my part...

I've owned mine for three years with no issue and when contemplating what I've done differently that may have caused or triggered the issue and the only thing I could think of was a recent trip to Silverstone. Thanks to horrendous weather at the British F1 I had to be literally pushed out of a field that was covered with at least 12 inches of mud. This left the underside absolutely "caked" with filth. Could I have blocked some drainage hole at that point? I have not had the car up for a proper pressure wash and there is still lumps of grass and other evidence of the weekend visible that I couldn't get to during its regular wash. This wasnt just a bit of mud at Silverstone I hasten to add, there were proper off roaders stranded... Am I clutching at straws??

[gupsterg]

Firstly just sharing my findings... as you have a saloon so rear washer not apply... you have checked all points I did AC, plenum chamber...

From front to back a box section runs under floor this has drain holes, these drain into channels in the plastic underlining... underlining have drain holes as well which are bigger...

Why rear passenger floods when box section is not draining is that front section of floor bungs are sealed by sound deadening sheets (made from bitumen type material) rear are not...

The simple test without interior removal is jack up car... you only need one on passenger side front, axle stand on front subframe... about 10 plastic type nuts holding underlining to chassis... I undid these at arms length easily as I feel uncomfortable having my body under standard trolley/axle jack... then you will note a box section which has 6 bungs the first and last will have small holes the other will have none...

http://i1247.photobucket.com/albums/gg629/gupsterg/Bucket%20load%20fun%20A6%20Avant/DSCF4894_edit.jpg

Above is my car with underlining off, blue box & stick are the drainage bungs... remove these bungs... whack a hosepipe in plenum chamber if they start gushing water you got your answer to why flooding inside...

Sorry can not give any more insight... if you have factory fit bluetooth you want to get to the bottom of this as that module is in front passenger footwell and will flood with water...

[Lbcvantage]

Thanks for all this, the car has been on the back burner for a bit for one or two reasons I won't bore you with. I see you have sorted yours on the other thread which is good news, I have been monitoring mine and its been staying dry (despite the horrendous rain) then this weekend the foot well filled up like a swimming pool without warning, or rain! So I've bitten the bullet and have just dropped mine at my local garage armed with all this info so hopefully they can get to the bottom of it. PS nice spot on the Bluetooth module... my telephone system failed over the weekend, I guess that will be terminal. :0(

[gupsterg]

:sad6: to hear that bluetooth gone and you still have problem... I'm pretty certain you must have the same issue as me... the drains in bungs are two small... mine is all fixed thankfully, even with heavy repeat rain all been good (quickly praying to the Audi god) I will be fitting a water sensing device soon... I think that mod will fit/work for all A6's (4F)...

If there is any photo's, etc you need please feel free to PM...

[Lbcvantage]

Glad to hear all your work paid off and will continue to help people down the line. I'm currently at the mercy of the Audi gods hoping its one of the things we've discussed. Only niggling issue is I have is that I had no problems during the horrendous rains a couple of weeks ago yet the problem returned during a dry weekend... Perhaps is something as simple as the AC drain and a relativity simple fix. I will keep the thread going until its sorted.... or I burn it in a field haha! :zx11:

[Lbcvantage]

Just collected the car. After water testing we stuck the hose into the passenger side plenum drain and found water gushing from the channel under the car. So after showing him this thread he got the car on the ramp, removed the plastic cover and removed the grommets. He said he "couldn't believe how much water came out". So now the car is drying in the drive hopefully sorted but I will monitor it for a few weeks before replacing the BT module just to be sure. Time to pray to the Audi gods again.

[ragebe]

Rather than start a new thread (or add another message to Gup's The most Lemon Audi A6 Avant strikes again - Page 14 (http://www.vwaudiforum.co.uk/forum/showthread.php?139747-The-most-Lemon-Audi-A6-Avant-strikes-again/page14)) I've had the same problem for the last few days.

Removed the under-tray at the week end and mine had 13, captive, nylon nuts and a push-in, nylon rivet. I put the car up on 2 x jacks with no axle-stands (not the best idea) and could just about reach the nuts in the middle of the car. Fair bit of leaf mould and mud in the tray and the drain-bungs. Not too much water came out after I'd cleaned it all up and the carpet in the rear, near-side footwell is pretty dry now (it had been soaking) so I'm hopeful this will resolve the issue and I won't need another BlueTooth module.