Audi A6 - Wet Footwell!

[D&M 66]

Hi all,

We've got a 2004 Audi A4 Allroad Estate and have found the passenger side rear footwell is really wet. It's only that one footwell, the rest of them and the spare wheel well are all dry. Its fresh water, not coolant.

We've checked the scuttle panel, and thats clear.

Has anyone else had the same?

Just looking for some pointers where to check next. Any common leaks on these Audis?

Thanks in advance!

Edited December 19, 2019 by D&M

[EPV 631]

Have you ran water through the scuttle drains to be sure they are clear and water is running through?

[Mark101 536]

Does it have a sunroof?

[Stalker 180]

Plenum chamber underneath the battery, there is a little rubber flange that clogs up. Remove said flange and throw in bin.

If you have access to a ramp this can be done underneath by a young lad (watch him get drenched)

[David Horgan 564]

1 hour ago, Stalker said:

Plenum chamber underneath the battery, there is a little rubber flange that clogs up. Remove said flange and throw in bin.

If you have access to a ramp this can be done underneath by a young lad (watch him get drenched)

HAHA reminds me of watching that happen , It gushes doesn't it 

[D&M 66]

It was just a visual check. We'll pull out the battery tomrrow and see whats what.

Thanks for the tips!

[Grantlfc81 88]

We have had this recently but in the footwell of a 2007 a4. It’s gone now. Strange.

[J.T 39]

You haven't employed my old valeter have you, twat was always leaving windows wide open on cars! I'd come in after a night of rain to find fish swimming around in the door pockets. 

[D&M 66]

1 hour ago, J.T said:

You haven't employed my old valeter have you, twat was always leaving windows wide open on cars! I'd come in after a night of rain to find fish swimming around in the door pockets. 

Nope, but I've jetwashed a few then noticed the window was open a crack!

Just last month I loaded a car on our transporter in the pissing rain and drove from mid Wales down to mid Devon with it hammering down all the way... Got home to find I'd left one of the car windows down! Lucky enough it stayed dry inside, just the seat bolster got a bit damp. Will be double checking that next time!

[D&M 66]

Right, so...

Battery tray is clear, traced the leak to a poorly fitted/slightly broken pollen filter housing. Repaired and tested and no more leak!

Sucked out as much water as we could with a wet vac, probably took about 2l out.

However, now the bloody thing keeps putting the hazard lights on by itself.... No flashing, just all lit up solid. Turn the engine on, and they'll turn off for a few minutes then back on. Had to take the hazard light switch out of the dash to make sure they stay off overnight.

Bloody thing.

[Casper 272]

3 hours ago, D&M said:

Right, so...

Battery tray is clear, traced the leak to a poorly fitted/slightly broken pollen filter housing. Repaired and tested and no more leak!

Sucked out as much water as we could with a wet vac, probably took about 2l out.

However, now the bloody thing keeps putting the hazard lights on by itself.... No flashing, just all lit up solid. Turn the engine on, and they'll turn off for a few minutes then back on. Had to take the hazard light switch out of the dash to make sure they stay off overnight.

Bloody thing.

Had the same thing on a 2001 golf tdi once many years ago its a pain isn't it in-fact i think that is why the previous owner got rid of the golf because of the water leak 

Edited December 20, 2019 by Casper

[Stalker 180]

13 hours ago, D&M said:

Right, so...

Battery tray is clear, traced the leak to a poorly fitted/slightly broken pollen filter housing. Repaired and tested and no more leak!

Sucked out as much water as we could with a wet vac, probably took about 2l out.

However, now the bloody thing keeps putting the hazard lights on by itself.... No flashing, just all lit up solid. Turn the engine on, and they'll turn off for a few minutes then back on. Had to take the hazard light switch out of the dash to make sure they stay off overnight.

Bloody thing.

The rubber bung is under the battery tray. Unless that bung is blocked, water shouldn’t pool big enough to pour in via the pollen filter housing. 

[D&M 66]

1 hour ago, Stalker said:

The rubber bung is under the battery tray. Unless that bung is blocked, water shouldn’t pool big enough to pour in via the pollen filter housing. 

The rubber bung is missing, already taken care of!

In the paperwork it had a new battery fitted 4 mouths ago! Who ever fitted it caught the pollen filter housing. So only 2 bolts out of 3 was holding the housing down 

The dirt collected between the wing and pollen filter housing was allowing water to pool and get inside through the housing.

Taken the convinience module out  yesterday. That was wet with corroded connections - hopefully a thorough dry out and a generous amount of contact cleaner will see it right!

Edited December 21, 2019 by D&M

[D&M 66]

Just an update to close the thread.

Convinience unit dried out, cleaned up all the contacts... Reconnected, and its all working as it should do.

Thanks all for the tips!