[jdq]

Another possibility is inside your door skin there is a clear piece like plastic and is sealed with a butyl sealant ( black caulking) it may have come away from the door and not sealing.Pour water around window / door area while open and see if water comes out bottom.If you notice floor pretty wet it is probably soaked as there is a thick padding under carpet and there has to be alot of water to soak thru.I had to remove carpet to dry.