The water seems to come in when car is parked with the back of car at higher level than front in a down hill
for example.
what happens then is that a pool of water is trapped
below the door outside the door seal at bottom where the lower seal goes in a half circle following the curve at the lower bottom front part of doors.
A pool of water builds up there ,when the dam is high enough the seal gives in and water zips in, have checked it in rain storms and when pressure washing there.
probably a design fault,to little angel for water to run off or seal not high enough at bottom.
I will smack in silicon there to make an artificial slope so water gets a direction.
Swedeson
October 2012