A couple of tips learnt when replacing the waterproof door membrane. What to do about the speaker and door release both of which require holes to be made in the membrane?
First thing is to make sure the outer window felts are ok (invisible unless the window is fully lowered as they fit under the outer rubber) as these stop water gushing down the window and into the door. Same idea as the sunroof felt. This water has a tendency to run down into the door and fall onto the door release mechanism and the speaker cover. Both can lead to water damage of the door card.
The solution is to make internal flaps out of the plastic membrane when cutting the access holes. The flaps go over the speaker cover and release arm inside the door cavity to defect any falling water which then falls harmlessly into the bottom of the door and eventually out through the numerous drain holes. Simple but effective, and exactly how Porsche did it originally.
First thing is to make sure the outer window felts are ok (invisible unless the window is fully lowered as they fit under the outer rubber) as these stop water gushing down the window and into the door. Same idea as the sunroof felt. This water has a tendency to run down into the door and fall onto the door release mechanism and the speaker cover. Both can lead to water damage of the door card.
The solution is to make internal flaps out of the plastic membrane when cutting the access holes. The flaps go over the speaker cover and release arm inside the door cavity to defect any falling water which then falls harmlessly into the bottom of the door and eventually out through the numerous drain holes. Simple but effective, and exactly how Porsche did it originally.
uh: 
