More footwell mystery

[carl81]

Hi All,

Please see attached photo for a strange water ingress issue on my D2 S8. It is almost like it is coming up from the floor. This is the drivers side, rear footwell.

I'm 99% sure it is rain water that is getting in. I've been out of the country so the car hasn't been used in 2 weeks and seems to be worse than when i noticed some slight dampness just before I left. So the car has been stood and it appears to have got worse.

I thought maybe it was the classic heater system / aircon blowing water in but you can also see by the picture that under the seat and around rear blowers are dry. I've tried the aircon on full and went for a small drive, no sloshing or water coming out of the vents.

I did unblock the sunroof drains last year and there is no water around my headlining. So assuming it is rain water any idea how and where this is coming in from?

Thanks again.

[HPsauce]

Have you taken the front carpets up and looked under there too?
The air ducts run under the carpets to the rear and the joints between sections are far from airtight, so it's easy for water introduced at the front to find its way to the rear carpets.
Been there, got the t-shirt. More than once.

[carl81]

Yep it’s wet under the front carpet around the air duct. What does that suggest? Blocked drain?

[HPsauce]

Blocked orange drain(s) and/or scuttle drains.

[carl81]

Awesome thanks again. Orange drains look self explanatory. Still a bit confused as to the trick with the scuttle drains. Is that the trick with the copper pipe?

[HPsauce]

Get a bright torch out and have a look at them; if they look clear pour some water in and check it runs out quickly.
If not I've cleared them with various methods, though a flexible plastic tube works for me, not having thin copper pipe.