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Water on the Floor

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I have read a few postings about water on the floor which can damage the electrics.  Mainly this has been related to drop-head models caused by blocked drains in the hood well above the rear wings.  When I looked further into this I found that this compartment drains out through a port that is behind the rear wheel arch front liner.  Mud gets behind this liner and blocks the drain port. With this in mind I decided to remove the liners on my 996 and see what had accumulated.  Mine's not a drop-head, but I thought it worth checking. 


On the passenger side the space behind the liner was almost full of mud. It had completely blocked the hole where water would have come out if I had a drop-head.  In any event the crud had accumulated to form a nice damp wedge which only needs oxygen to complete the start of corrosion.  I have now cleaned these areas out on both sides. 


If you have a 996, be it coupe, targa or drop-head, I recommend you remove this liner and clean out the crap.  The liner comes out easily with just three plastic nuts for which you will need a 10mm socket wrench.  The lower wing spat liner can also be removed, but that's not necessary to complete the job. 

Edited by Hilux2400
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Hilix, first off thank you for the tip!


But would you happen to have pics that show your liner in reference? Meaning, are you talking about removing the rear wheels and the plastic wheel well cover to gain access to these vents?

Edited by gcp
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Sorry no pics.


I took off the back wheels to give some space.  The drain hole is behind the liner that is on the front side of the arch in front of the back wheel. There are three plastic nuts with flanges. They should come off easily. But before taking them off brush the area to clean them off and spay them with WD40. This should help preventing stripped threads.


When you have the three nuts off just pull the liner out.  Removing the lower sill spat is a bit more difficult as there are both posi-drive head self tappers and Torq headed self tappers.  You don't need to do this as the arch liner has to be removed first and fitted last.  


Good luck  

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Another successful repair thanks to this forum! Behind the rear wheels, the driver's side drain was completely clogged while the passenger's side drain was 1/2 way there. In my view this is "must do" maintenance, every year or two, to assure no water damage is ever inflicted upon the electronics seating on the passenger's floorboard.


I thank you for all your help!!

Edited by gcp
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