Blocked drain holes on a6 c5 2.4 auto avant flooded interior

[mrnice.]

This issue is well known yet it's still happening almost weekly just on here alone.

It's really starting to get up my nose now.

How can we (as a whole) make it more obvious to the masses to try and prevent this?

To start with you could make it a sticky on the top of this sub forum, on the Land Rover forum Im a member of they have done similiar, and theres also a sub forum that covers all the common faults and also a "busters how to" that gives you step by step instructions complete with pics to help you fix these faults. stops people (especially newbies) asking the same questions over and over again.

If when members work on fixes on their cars they could spend the time to write up a small thread about it (ideally complete with pictures) we could put them all together and build up a comprehensive online library of all the common (and maybe not so common) faults and fixes for members who have yet to experience these faults. It could save a lot of people a lot of time, money and hassle.

Im a firm believer in preventative maintenence , for example this thread has made me aware of the gutters blocking and the pollen filter housing defect something I may not have been aware of until I had a soggy footwell and all the problems that come with it. something I will now be making sure I stay on top of.

Hope this helps.

[blackie781]

I have an A6 Avant 54 plate,

Well, the problem has come back, (see post 21) the front footwell is absolutely soaking.

When i checked the drain holes the one under the battery seemed clear, I couldn't get to the one under the brake servo,

I'm wondering if there are other drain holes that are blocked up.

Can I remove the Convenience module and run the car without it until the problem is sorted?

I had the same problem on my 53 plate Passat, I did run it for a very short time without the ccm plugged in. It wont do the car any harm, its just bloody annoying, one loses the use of alot of things that are taken for granted ie. electric windows, central locking and key fob, remote boot release, im not sure but i think the fuel filler flap is on that circuit too (please correct if wrong). I'm sure there are afew other things in there too. I suppose it depends how much you use the things, disconnect and see how you get on.

I did take my interior out and let it dry in a heated hangar overnight and it all went back in a dream, however I would advise changing the pollen filter seal (as mentioned in another post) it isn't too hard a job and will pay dividends in the short and long term.

IMG00027-20111206-1925.jpgIMG00028-20111206-1925.jpg

Hope it helps

Chaddy

[mrnice]

I've just resolved soggy carpet/boot issues on my 167k 2001 a6 1.9tdi avant with that i bought last month.
There was a small amount of water sloshing around in the front and rear n/s footwells, on boot floor, inside tailgate and in cubby hole in boot under toolkit.
Sorry not many pics but I'll describe what I did.
Thought some preventative medicine was in order also so I just tackled all the known problem areas as I plan to keep this car long term.

It was definitely leaking from the pollen filter housing (both from the base and from water dripping onto the filter directly off windscreen due to badly fitted plastic cowl thingy at bottom of screen),
also the tube to rear wash/wipe was leaking from all 3 usual places where there are joins plus it had invented a new few new places to split and leak (inside c pillar and out of wiper motor housing in tailgate). There was a previous fix in the bung between tailgate and roof on o/s- a piece of heavy rubber tube in lace of the plastic tube where it had split due to opening/closing tailgate.

Tackling the wash/wipe I first rebuilt the wiper motor with the kit from audi-

This replaces the tube within the wiper spindle that leads to the washer jet and the jet itself, my old one had disintegrated and the jet had disappeared.

Then I traced the tube all the way from the rear wiper to the front bulkhead- It was leaking in the n/s c pillar, in the boot cubby hole (above toolkit), in the rear footwell and at the front bulkhead, I super-glued the bits where it was leaking from joins and where it had split I cut the pipe and used 8 inch lengths of hose to join it again.
I noted that someone had previously ripped (literally) a section of carpet from the n/s rear footwell and jammed an ill-fitting piece of copper pipe in the tube where it had previously split. This rubbish fix was leaking profusely. They had also covered the bare floor there with several filthy, worn, dog-hair-matted bits of old tesco value floormatt.
Rather than bother taking the entire carpet out to gain access to the front footwell I just cut it under where the matt sits since I didn't have a full carpet anyhow. I left this section drying next to the boiler in the house for a week as it was soaking.
I also drilled a new 15mm drain hole just in front of the front passenger seat with a new rubber plug that can be removed if there's a leak in future.
Also, before starting all this I treated the screen wash bottle to some sterilising fluid (miltons), as I didn't fancy legionnaires disease or getting sprayed with any other minging bacteria.
Pic of front n/s footwell with the expensive CCM (comfort control module or convenience control unit or whatever) housing that doesn't want to get wet-

I unplugged this and checked it out- it wasn't wet but some wiring had been replaced (and poss the ccm itself) in the past so it had been submerged in water before.

All that took care of the leaking from the screen wash, now for the awkward, annoying bits under the bonnet (water plenum chamber under windscreen).
Removed battery, battery tray, ecu housing, cabin filter housing, windscreen cowl (bit thats meant to clip onto bottom of screen- mine was loose).
Cleaned out both drain holes bellow (someone had previously cut down the bungs), and everywhere else under battery tray.
I got some quality heavy duty external builders silicon and-
Re-sealed ecu housing to bulkhead with the original gasket (I've heard this can leak into o/s front footwell).
Re-sealed cabin filter housing to bulkhead (with a very thick bead of sealant).
Made sure the cowl on bottom of windscreen was properly located (with a smear of the sealant), it snapped into place with a bit of jiggling.
I had previously made a cover for the cabin filter that would stop water dripping onto it so just re-fitted that, not sure it'd be needed but thought i may as well keep it as it doesn't effect the operation of heating/ blower etc.
Ghetto cabin filter cover made from old plastic box-


Job done then, it's all a bit ghetto but so far very effective and I look forward to not doing any of it again for many years.

[mrnice.]

good concise post with pics, very usefull. Thankyou.

[mrnice]

Thanks!, seems to have been covered lot but thought i'd add my bit

Cool username btw!

[mrnice.]

LOL thanks buddy, when I went to register my normal username (mrnice on 3 other forums-same avatar) it was already taken, I looked for any posts by mrnice and when I couldnt find any I assumed the name was registered but nobody was using it so I took the name with a full stop at the end and started posting, 30 posts later and you appeared, I must admit it confused me at 1st lol! hopefully if we have different avatars it shouldnt cause too much confusion (doesnt help we both registered in May 2012) but if it does we can always flip a coin for it and one of us could be misternice.

What can I say, great minds think alike!

Take care mrnice from the other mrnice. .

[mrnice]

Must add an avatar when i get a minute!, back on the topic though and despite the recent deluge of rain and copious use of screen wash to tackle the greasy Glasgow film of crap on the windows, the floor of the avant is bone dry, happy days! (now to move onto all the other niggly broken bits)...

[djt1954]

Hi, I think you may have the answer to my problem, I went through the usual problem of the blocked battery drain, only discovered when a deluge of water poured over the wife's feet... cleaned that out and then discovered a soaking wet n/s floor. I tried drying this out but then my real problems started when the central locking locked me out of the car. I was only able to open the drivers door with the key and the rest of the doors remain firmly locked. The key fob now does nothing so I suspect I have a waterlogged control unit under the carpet. My first problem is getting to it, do you have any idea how to disengage the central locking to allow me to get at the unit?

[nigelbb]

The only problem with removing the plugs completely is that you might suck engine fumes into the plenum chamber and into the car through the air conditioning. Whetehr you think this is better or worse than the risk of water ingress is up to you.

What engine fumes? Possibly a slight smell of warm oil but that's all. Your engine should not be producing any fumes tht could be sucked nto the cabin unless there is a leak in the exhaust or similar.

[NickPicks]

What engine fumes? Possibly a slight smell of warm oil but that's all. Your engine should not be producing any fumes tht could be sucked nto the cabin unless there is a leak in the exhaust or similar.

Or if the cam chain tensioner gaskets leak and dribble oil onto the exhaust manifolds.

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