Mine does it if it's outside and rains real hard, but I know where it's coming from. The door seals are bad. The Darts can be even worse about that since there's no frame around their doors. Take a piece of printing paper and fold it in fourths and close the door on it all along the top edge where the window meets the seal at the top and make sure it pinches the paper everywhere. If you get a spot where there's no resistance, there's a leak.
