sjg1138

Has anyone replaced the plastic membrane inside the door and know the part number? I'm about to take my passenger side door apart to track down a leak. I understand there is a large sheet of plastic (the membrane) that keeps water from getting into the car.

DBJoe996

Need year and model.

soverystout

You can reuse the membrane if you take a hairdryer to the adhesive around the perimeter of the membrane. It's a pain but I don't think the membrane is cheap.

DBJoe996

I removed my door panel and formed foam membrane on Saturday to replace the drivers side window regulator. It was fairly easy to remove carefully using my fingers and working along the edges. It is not plastic, or a plastic sheet but rather a completely formed foam piece. I looked up the replacement cost prior to removing the door panel just in case. For my 99 C2 it was somewhere around $90 for the formed membrane. I can help you find the part number, but cannot help without knowing the year/model, thus my earlier post.

Hurdigurdiman

From the description of what is used inside the door, surely there must be a cheaper yet just as effective preventative measure to keep water out of the door. My thoughts are something along the lines of an exercise mat or foam piece larger than the door. Something that can be cut exactly the same shape as the original. Check out Walmart and the Coleman section camping equipment. Just a thought. You know the exorbitant prices of Porsche parts. If the membrane is damaged and is in fact like a polythene sheet then I am sure you can come up with the same sheeting at a boating place or Walmart to maybe patch the original. Hey just a thought. Hope you solve your problem.

sjg1138

Thanks. It's a '99 Carrera cabriolet.

Adker

Just go slowly and it will come off, heat should help. You would have to just start tearing it off to hurt it.
$77 is a bit expensive so go slow.
http://www.autoatlanta.com/porsche-p...section=807-10

sjg1138

I'm guessing that whoever worked on the door before me broke the foam... I'll let you know what happens once I get the panel off.

porsche-t

I replaced the foam on my drivers door. I think I paid about $45 for the part from Suncoast.

Adker

Did you check that the two rubber plugs are in the bottom of the door? If you need to repair it, I would use 3m 80 contact adhesive and a piece of plastic sheet. Tape didn't stick to mine very well.

sjg1138

The water is coming from up high. I think I might even see some damage to the board behind the leather an inch from the window sill. Also the water came out of the carpet above the speaker grill in the door and dripped over the speaker grill.

DBJoe996

Sounds like you need the door sill seal, the one the window glass goes up and down in, and also has the mirror attachment seal. I would remove the door panel and formed foam membrane so you can see everything inside the door. Then sit in the car and have a helper spray water all over the outside of the door and see if you can locate the leak. One note, if you have seen or worked with the original door formed foam membrane, you will immediately see that it would not be easy to fabricate a new membrane that would work right. It is formed in certain ways and is not just a plastic sheet like you might find on an American car. I also think it serves a purpose of sound deadening and dust seal, as well as keeping any water that may leak into the door from soaking the door panel. Any water in the door would fall to the bottom door drains. However, if you don't really care that much.....

sjg1138

Understood DBJoe. Sound proofing is important to me so if need be I'll buy new foam from Porsche. I'm hoping its not the door sill seal given the $200 price tag. I always understood that some water was expected to make it past the door seal and that was what the foam/membrane was used for - to stop the water that made it past from getting into the cabin.

sjg1138

So I took the door apart and examined the inside. Unfortunately I was not able to test it with water. I did find some compelling evidence though. At the top of the door, just under the mirror, there were drip marks from water on the inside of the door and above the foam. I'm pretty sure any water on that area would end up in the cabin. I have pics if I can figure out how to post them. After this I am convinced that a new door seal is the answer to stopping the leak.

sjg1138

and here is the pic... Does this look like I've got water coming in to you?