Quote:
Originally Posted by Brandon314159
I've seen what he is talking about. Its a uncommonly seen unit on either side behind the bumper in the rear quarter panel area.
If I were you, I would replace the rubber or perhaps, if the rubber parts are good, look elsewhere for your problems.
I have offroaded my car in mud/grass and didn't have problems with these vents plugging up and staying open.
Give the trunk some time to dry out and then go from there...you won't like the way the doors close if you block these vents. Anyone who has every properly rebuilt a VW bug knows what I am talking about. A well sealed car is sometimes a bad thing
Thus MB let the air out 
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Thanks Brandon, I totally forgot about the door closing issue. That exactly explains why they are so big and hinged the way they are. I think I'll see how much these cost to replace - the water staining under them indicates that they do pass water. Now that I've fixed the rear window seal

I can see just how much water these let through. I want to get it right before I put the trunk carpet back.