Left Hand Side rear footwell is wet

Aussie_550i · 07-25-2022, 01:20 AM

Hi all,

I was having a great Sunday washing my car and then vacuuming it, when I came across the LHS rear footwell was damp.

I couldn't feel any dampness from under the front seat, the B pillar and from the tunnel.

Any ideas on how (apart from someone spilling a bottle of water, which didn't happen)?

I'm leaning towards a sunroof drain?

Any ideas are appreciated.

Thanks

AussieBob · 07-25-2022, 04:59 AM

I know in my old E39 it was missing plastic plugs from under the car body. Installed replacement plugs and the rear floor was never wet again. Perhaps the F10 is still the same BMW design, worth a look underneath the car.

Qsilver7 · 07-25-2022, 02:46 PM

...or could it be the same issue that plagued the e39 and other 3/5/7/X series which was the door's vapor barrier was the culprit...the adhesive would fail and water that runs down inside the door...instead of it being directed toward the door drains...would follow the path of least resistance and flow into the rear foot well.

There should still be tons of info and video (on YouTube) about this issue.

Edit: here's a video that shows what happens with a failed vapor barrier:

Aussie_550i · 07-26-2022, 03:15 AM

Thank you for your responses. Going to the workshop on Saturday, so I'll check both suggestions out and report back.

07-25-2022, 01:20 AM	#1
Aussie_550i Private 12 Rep 80 Posts Drives: 2011 550i, 2017 430i Join Date: Nov 2014 Location: Melbourne, Australia iTrader: (1)	Left Hand Side rear footwell is wet Hi all, I was having a great Sunday washing my car and then vacuuming it, when I came across the LHS rear footwell was damp. I couldn't feel any dampness from under the front seat, the B pillar and from the tunnel. Any ideas on how (apart from someone spilling a bottle of water, which didn't happen)? I'm leaning towards a sunroof drain? Any ideas are appreciated. Thanks
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07-25-2022, 04:59 AM	#2
AussieBob Private 80 Rep 92 Posts Drives: 2010 F10 "M5" Join Date: Sep 2018 Location: Australia iTrader: (0)	I know in my old E39 it was missing plastic plugs from under the car body. Installed replacement plugs and the rear floor was never wet again. Perhaps the F10 is still the same BMW design, worth a look underneath the car.
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07-25-2022, 02:46 PM	#3
Qsilver7 Major General 4430 Rep 7,477 Posts Drives: F06 650ix GC / F15 X5 50i Join Date: Oct 2016 Location: Indiana, USA iTrader: (0)	...or could it be the same issue that plagued the e39 and other 3/5/7/X series which was the door's vapor barrier was the culprit...the adhesive would fail and water that runs down inside the door...instead of it being directed toward the door drains...would follow the path of least resistance and flow into the rear foot well. There should still be tons of info and video (on YouTube) about this issue. Edit: here's a video that shows what happens with a failed vapor barrier: __________________ 2015 F06 650ix Gran Coupe`(Moonstone/Cohiba Brown)\| 2014 F15 X5 50i MSport (Space Gray/Mocha) Become a BMW CCA member! Click HERE to join and feel free to use my BMW CCA member #191509 as a referral. Last edited by Qsilver7; 07-25-2022 at 02:52 PM..
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07-26-2022, 03:15 AM	#4
Aussie_550i Private 12 Rep 80 Posts Drives: 2011 550i, 2017 430i Join Date: Nov 2014 Location: Melbourne, Australia iTrader: (1)	Thank you for your responses. Going to the workshop on Saturday, so I'll check both suggestions out and report back.
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