My car was parked on the street 2 nights ago and although it rained, that is normal for this area. When I got in, there was a flood on the floorboard of passenger side with no apparent reason (no window down, moon roof closed, nothing else seemed wet). Could it be a pipe that runs to the heater of something? It's not overheating or anything, not sure what to do and how to prevent it from happening again. It's parked in the carport for now.