A4 leak into footwell!

**GS tone** · 23-01-2010,03:41 PM

Hi
Used my A4 estate today first time for about a week and found passenger footwell and rear swimming in water!
I can see it running down the carpet from under the dash
any idea before I start taking things to bits?
Cheers

**olds_kool** · 23-01-2010,04:08 PM

check plenum chamber (where battery is) see if its full of water, if so unblock drains plenty of info on this problem if you search forum

**stevie-g-2.6** · 23-01-2010,06:33 PM

as above, but also check the gromit where the bonnet release cable goes through too.

also something else to check is that little plastic cover over your pollen filter.

**GS tone** · 23-01-2010,07:38 PM

great thanks guys will check tomorrow

**chris.r.** · 25-01-2010,11:29 AM

What about the A/C condensate water outlet? Maybe blocked?

**GS tone** · 25-01-2010,07:28 PM

it was the two drain holes under the battery
the battery tray is almost rusted away!
unbelievable amout of water came out
thanks again

**AutoTDI** · 13-01-2011,08:26 PM

Have just cleared drain hole (again) under battery after water ingress. This seems to happen every couple of years and following heavy rain. I removed about a gallon of water using my Pela extractor. Looking around Poundland the other day, I came across a "Water Leak Alarm" which looked as if it might be useful for alerting me to a potential flooding situation. The device comes in a small round plastic box and is powered by a 9V PP3 battery. It fits neatly just in front of the brake servo. I did some checks first for battery current and did not see any movement of the pointer on the 1 ma scale. When I bridged the sensor pins with two wet fingers, about 50 ma was drawn from the PP3 and the device emitted a loud screeching sound. So it looks as if this device, if fitted with an alkaline battery, should be OK for a couple of years. I should add that I do regular visual checks for flooding, but obviously not often enough!

**Sam** · 14-01-2011,12:13 PM

Poke the drain hole bungs out completely to stop the blocking in the future.

**AutoTDI** · 14-01-2011,02:04 PM

Originally Posted by mycarsavw

Poke the drain hole bungs out completely to stop the blocking in the future.

Thanks for the tip. I did consider this, but as the blockage is usually caused by a leaf spread across the opening I'm not sure how this would help. What it really needs is a drain hole of about 2" diameter and/or a more effective leaf trap below the windscreen. The vulnerable area seems to be near the passenger door. Unfortunately I live in a heavily wooded area and my roof gutters (house) are another problem.