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Old 08-02-2013, 03:23 AM   #1
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Wet carpet behind seats

Hey All,

In the often wet UK I have started to get a problem with my boxster (1999 2.7) which mainly kept outside.

When it rains the carpet behind the seats becomes wet.

It appears that it's more the underside of the carpet (as the top stays fairly dry) but if I pull it up there can be a small puddle. Driver side appears to be worse - but both get it.

I have checked out the drains (removing some crap but still the problem persists). Any advice as to what to look for or if it is still the drains / would lead to the underside of the carpet?

Hey appreciated! L
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Old 08-02-2013, 03:58 AM   #2
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What are you saying about our fair country? it's always fab convertable weather here, lol.

Have you taken the carpets out? normally it's the drains but it could be a hole drilled by a previous owner or damage for example. Does water flow through freely when you use a hosepipe down the drains?

https://sites.google.com/site/mikefocke2/drainsdiagram

You want to sort this before it destroys the expensive bits under the seat. As mentioned earlier, try taking out the seats and lift the carpet and get someone to use a hose pipe and see where it's leaking from if the drains are definitely clear.


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Old 08-02-2013, 04:08 AM   #3
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Disconnect the battery before removing the seats - otherwise it will throw an air bag idiot light
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Old 08-09-2013, 03:25 PM   #4
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One other point is that there are foam trays that sit under the roof on either side (under the roof lid) that funnel the water to the drains. I had a shaft snap once on the roof assembly & it put a good rip in the tray. My car doesn't see rain, but after washing I came to realize water was getting through on one side because of this. Hope you find the cause.
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Old 09-25-2013, 10:30 AM   #5
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Hi Lboxster

I'm guessing the nice summer we've just had has put this problem on the shelf!

When the inevitable rains arrive, run your hand along the bottom of the door carpets: it they are wet, then the water is likely getting in via the door. In my case it was caused by a door window being misaligned on its support rail. Water was leaking in through a gap between the glass and the roof seal.

If the door carpets are dry, you've narrowed it down a bit. However there are still many potential candidates for the cause of the leak. Looking at the rear of the car for instance, the hood drainage is internally routed to a large pan on both sides and then funnels water down a tube to the underside of the car. Breaks, tears or blockages in this system will cause water to find its way into the cabin.

Good luck!

Last edited by Stan_D; 09-25-2013 at 10:45 AM.
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Old 09-25-2013, 11:22 AM   #6
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Did you check against the diagram to see that you got at all the plugs?

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Old 09-25-2013, 01:04 PM   #7
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I had a similar issue. There were leaves and crap that clogged the drain areas where the water couldn't properly drain. Don't leave it parked outside
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Old 09-25-2013, 01:19 PM   #8
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Living in the Pacific North West we too have similar weather. I highly recommend checking the drains bi-weekly. Call me OCD but after having my boxsters "brain box (m53)" that controls almost every aspect of the car, get wet and stand me, its a must!
Also that foam under the carpet is sooooo thick it takes forever to dry it out (if carpet is not removed)
Wet vac it like none other, try to get warm dry air circulating under the carpet, and check those drains! good luck
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