2001 buick century. any ideas where water on passenger front floorboard could be coming from after a hard rain. It has happened twice this year - both times after a hard rain. We have checked the radiator and it doesn't lose any water or coolant. The first time I could have had the window cracked a bit, but I am sure that I didn't the second time. We did see a couple of small slits in weatherstripping at front passenger door. Could 2-3 small slits cause rain to accumulate in floorboard after rain? We also tried to see where it might be coming in by using water hose with someone sitting inside and didn't see anything. Any help would be appreciated.