Door question - duplicate.
 

I've been troubleshooting my car for the wet rear seat floors and was waiting for the next big rain after cleaning my sun roof drains. I didn't get anything out of them and they didn't seem clogged, so I was not hopeful that i fixed the problem.

Long rains for the last couple days and sure enough, the X has water in both sides in the back. Further, it rained so hard and long that I actually saw water migrating around the bottom of the door (inside of the wx striping) and into the car. I also see bubbles when I press on the two plugs in the bottom of the door now, so clearly water is pooling in the door.

Hopefully you guys can help me understand what is going on before I pull the door cards and risk all the old plastic problems that this job entails. I have two new vapor barriers, which seems to be the cause, but just what is supposed to happen to the water that pools inside the door, after I install the barriers, with new butyl tape i have on order?

Is there a door drain(s) that I'm not seeing that the water is supposed to drain out of but instead is finding a more easy/clear path past the barrier and into the car? And if so, do I need to make sure these are clear? I can't imagine the door is supposed to be 100% water tight so no rain gets in at all, or that the rain doesn't have anywhere to go should it get in (other than into the car).

I've got a couple days before my butyl tape gets in, so any advice is welcome before I pull both rear door cards.

I "think" the door drains are just under the weatherstripping but it's been a long time so maybe someone else can chime in. Are you really really sure that the sunroof drains are OK ??
The vapour barrier is to keep water vapours from condensing in the door due to differences in temperature not to prevent leaks.

I've found this to be more of a problem when parked on a slope, nose down. Nose up, the rear doors don't leak. Nose down they can/do.

I agree. Pillars leaked when parked nose down. After cleaning and straightening pillar hoses, leaks went away.