Water leak into boot/rear seat

[Me9141]

Hi all,
Hope all are well.

Got a 2003 5 door Polo. Suddenly it is leaking water into the boot and rear seat base. Its all down the passenger side only.

At first, I thought it was just the washer fluid pipe which has join in the passenger side of the boot, as I could smell the washer fluid, so pulled down the carpet and reconnected the washer hose.

I cleaned and dried the seat and the boot.

But a few days later it has got wet again. No smell of washer fluid and the connection is intact.

I have checked the roof aerial base seal, which was changed a few years ago and it seems ok. There is no staining on headlining either.

I have run water over the rear passenger door seal and nothing obvious looks to be leaking.

I have had the rear passenger side light filling with water, I bought a new (Alibaba) bulb holder as the old one had corroded, but it was not any good and it filled with water again, so bought a used (original) rear light and it still did the same thing. So, I drilled a few holes in the bottom of the light.

Anybody had a similar issue or know what else I could investigate?
Any help is appreciated.

[Maarten]

Much of these problems come from the taillights or third brakelight.
You could also check the doors inner panel, sometimes the seal becomes porous and lets rainwater in the interior

[Me9141]

Thank you.

I'll take a look in the next couple of days.

[littlepolo]

How much water is entering the cabin? The only 'large flood' I experienced was through the rear wiper fitting but that is nowhere near your wet patch?