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Porsche 911 / 996 Water Leak Rear Floorwell During Rain

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Tried a search on this topic but most answers pertained to boxters and 944s, where there was much discussion, but very little pertaining to the 996.

I have a 2000 porsche 996 cabriolet in San Francisco CA. I have noticed that sometimes during especially hard rains, water will build up in the right hand side rear passenger footwell, beneath the carpet. I have checked the roof pretty thoroughly and everything seems quite dry up there. Where could this water be coming from? The walls seem to be dry as well.

I have found some discussion in other forums suggesting that 944s have a problem with drains clogging up underneath the battery box, but do not understand how this could leak into the rear right passenger footwell without soaking underneath the carpet of the front passenger footwell ;-) Is there some sort ventilation system that stretches to the back seat area?

I removed some leaves from the drain area under the battery box and will report back if that stops the leak. BUT, any other ideas or suggestions would be much appreciated. I am hoping to avoid spending money unneceesarily if this is something that I can fix myself ;-)

thanks much!

Brian

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Tried a search on this topic but most answers pertained to boxters and 944s, where there was much discussion, but very little pertaining to the 996.

I have a 2000 porsche 996 cabriolet in San Francisco CA. I have noticed that sometimes during especially hard rains, water will build up in the right hand side rear passenger footwell, beneath the carpet. I have checked the roof pretty thoroughly and everything seems quite dry up there. Where could this water be coming from? The walls seem to be dry as well.

I have found some discussion in other forums suggesting that 944s have a problem with drains clogging up underneath the battery box, but do not understand how this could leak into the rear right passenger footwell without soaking underneath the carpet of the front passenger footwell ;-) Is there some sort ventilation system that stretches to the back seat area?

I removed some leaves from the drain area under the battery box and will report back if that stops the leak. BUT, any other ideas or suggestions would be much appreciated. I am hoping to avoid spending money unneceesarily if this is something that I can fix myself ;-)

thanks much!

Brian

There are other drains in the back on a Cab. Take a look at this: http://www.renntech.org/forums/index.php?showtopic=7791

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The common leak in a 944 that you mentioned doesn't actually leak into the rear of the car. The drains under the rain guard at the base of the windshield get clogged than the water begins to rise. Eventually the water reaches the fresh air vents and pours into the climate control system. Your leak is most likely the result of the drains in aether side of the car becoming clogged. You can access them easily by looking for the holes as a friend operates the top.

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Thanks to everyone for the quick and thorough response! I really appreciate your help.

all the best,

Brian

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I have a similar issue 2002 996 convertible my convertible top drains drain fine but my rear passenger seat foot well as well as front passenger seat carpet is wet. There no moisture under the actual front seat though.   Anyone have any ideas  

 

thx 

Chris 

 

 

 

 

 

 

Edited by Ckat1975
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You need to check all of the drains.  Run some weed whacker string down the drains to make sure they are clear.

 

cab drains.jpg

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Hi..I live in rainy Ireland and this has been a real problem in my 996 Cab.  I brought your water drain diagramme to my garage and they removed the interior side panel to find an easy solution.  A number of drain tubes collate into a collection point like a mini funnel which had built up a pot of sludge and water could no longer flow through same and out of the car...so diverted to the back foot wells.  Who thinks up the stupid systems??

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