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Soaking wet carpets behind driver's seat - please help.

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Old 12-30-2019, 11:51 AM
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Soaking wet carpets behind driver's seat - please help.

Hi all,

I'm getting soaking wet carpets and pools of water in the rear passenger footwell, driver's side only. All my drains are clear around the windshield and there is no evidence of water entering through the air box.

I removed the under trays, pulled back the carpets and popped the grommets in the floor and to my horror, there was a huge amount of water. I don't have a sunroof on my car so it's not that which I understand is a common issue.

Really at a loss now as I can't seem to find the source! Any advice would be greatly appreciated!

TIA
Old 12-30-2019, 09:19 PM
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2011 C300 4MATIC SPORT
Any signs whatsoever on headliner? Thinking if there is something going on with the roof rack mounting points.

Check the date codes on your windshield and rear window. Perhaps one was replaced and sealed poorly.

Old 12-31-2019, 09:31 AM
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Originally Posted by karlt10
Any signs whatsoever on headliner? Thinking if there is something going on with the roof rack mounting points.

Check the date codes on your windshield and rear window. Perhaps one was replaced and sealed poorly.
Many thanks for the reply. Date codes look good. No signs of water on the roof linings at all :/ very frustrating.

I did spot a pipe that runs under the carpet on the driver's side. Not sure what it is though? As you can see, quite wet around there.

Old 12-31-2019, 10:41 AM
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Might be coming through the door area, does it sound like there is water in the door?
Old 12-31-2019, 10:59 AM
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Originally Posted by Just204
Might be coming through the door area, does it sound like there is water in the door?
Gave the door a good shake. Nothing doing.
Old 12-31-2019, 11:35 AM
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Originally Posted by GermanWhip
Gave the door a good shake. Nothing doing.
inspect the weatherstripping for the door on the body, check for deformities or cracks. If nothing, try coating baby powder on the weatherstripping(make sure everything is dry, close the door fully then open. Look for any odd impressions on the weather stripping, should be uniform. If not decent chance weatherstripping is deformed.
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Old 01-01-2020, 09:09 AM
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Originally Posted by Just204
inspect the weatherstripping for the door on the body, check for deformities or cracks. If nothing, try coating baby powder on the weatherstripping(make sure everything is dry, close the door fully then open. Look for any odd impressions on the weather stripping, should be uniform. If not decent chance weatherstripping is deformed.
LOL. That is EXACTLY what I was going to suggest...


GermanWhip- what is the year and model?

Old 01-01-2020, 09:14 AM
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Originally Posted by karlt10
LOL. That is EXACTLY what I was going to suggest...


GermanWhip- what is the year and model?
I have a 2009 C220 CDI sport saloon without a sunroof. So it rained a little this morning which presented a good opportunity to check the weather stripping and seals......Bone dry.

The only thing I have noticed is that the seal around one of the wiper arms by the scuttle is allowing the smallest of drips onto the back of the fuse box in the engine bay. A red herring perhaps and surely not not enough of a bad seal to create the wet carpets but needs fixing.
Old 01-01-2020, 11:02 AM
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Originally Posted by GermanWhip
I have a 2009 C220 CDI sport saloon without a sunroof. So it rained a little this morning which presented a good opportunity to check the weather stripping and seals......Bone dry.

The only thing I have noticed is that the seal around one of the wiper arms by the scuttle is allowing the smallest of drips onto the back of the fuse box in the engine bay. A red herring perhaps and surely not not enough of a bad seal to create the wet carpets but needs fixing.
Well.... Check this

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