Water leak in rear passenger footwell

[DeadBug]

Hi everyone,

I've got a 3-door 2004 A3 2.0 FSI, which I absolutely love, so it really sucks that I've noticed over the last few days a sort of water leak, which manifests as water pooling in the right hand side rear passenger footwell. Its not a few drops - we are talking about a cupfull or so.

Since I have a sunroof, I automatically assumed this was now the problem as the two times it has happened were both after rain (but not heavy rain), but I felt around the perimeter of sunroof on the inside of the car and it's bone dry. In both cases, I was parked on an incline (I have now parked on a decline to see if it stops). Finally, where I am currently at is VERY moist and condensation off things like aircons etc is pretty hectic.

There doesn't seem to sort be a water 'trail' or anything - its as if the stuff appears at the footwell (so it might be flowing under the carpet?)

Anyway - did some research on the net and think it might be one of the following (still need to investigate them myself):

1) The window seal on the right hand door might have failed causing water to enter the door itself then run into the car.
2) A thread on the A6 forum meantioned a heater core or heater matrix failing (Anyone have any idea what the heck that is???)
3) The drain hole allowing condensed water from the aircon might be blocked and the water might be rerouted inside.
4) Some under-bonnet compartments (like the battery) might be flooded with water because of blocked drain holes. Water then flows under the carpet from the front of the car to pool at rear footwell on incline parking.
5) The trim at the bottom of the windscreen might be degraded, water pools in rear footwell for same reason as above.

I'm going to see if I can investigate each of these a little further, but I would really appreciate it if someone could either give me some more suggestions or eliminate some wrong ones for me. Or perhaps someone else has seen the same problem?

I'm sure some Audi techs also read this forum from time to time, so PLEASE guys! Help! I love Audi cars, particularly mine, and I really don't want to have to deal with water damage. I would take the car into a dealership to fix, but as luck would have it, I'm sitting miles from the nearest dealer on holiday at the coast - with no undercover parking!

Go figure.

[Badger61]

Get in touch with your Audi centre to see if your car is affected by a service campaign that has just been released regarding a water drain in the plenum chamber. I'm not at work at the moment and can't remember the campaign code but it may be relevant. Other than that this model hasn't had many water ingress problems but ask them to check for service bulletins for your chassis number.

[DeadBug]

Thanks Badger61,

I'll give them a call and ask.

It rained all of last night but with the car parked on a decline, there was no more water, so I kind of think it isn't water seals on doors or windows.