So... after it's rained for a month strait here, I have this same issue. Same as if I go to the car wash.

Driving to work today I can HEAR the water sloshing around inside the door. When I took a DA Polisher to the body, water comes STREAMING out of it lol.


With over 5 million hits on google for "Tahoe Water in Door"

Looks like this guy has the fix by poking the hole. I guess I could also drill another hole, using the tape on the drill bit trick so it doesn't go through the outside panel...

ugh.

 

Is your drain hole plugged with mud, maybe?
all new vehicles are having drain issues it seems
...

 

I used a small screwdriver to clear out all 4 doors. Passenger rear had so much water it was coming out the bump stop 3-4" up! it must have dumped 2-3 gallons...
Yea, no idea who would have thought that a 1/500th inch hole was enough to drain the door. It should have had at least 2-4 of these along the bottom.

 

Oh dang!