What could be causing water to leak into the floorboard of a car in the front and rear passenger side but not under the seat?

Vacume up all the water, even in the matting underneth, dry it completely dry towels will pick most of what is left after vaccuming, then dry it in the hot sun for a day so real dry. Then get in the car and have someone with a water hose run osts of water over all the suspected areas if no water enters then tray running your A/C on high for 20 minutes and checking to see if water is coming out of the drain pipe under the car.

I had an Accura 2 years ago with this problem on the passenger side floor it turned out to be three leaks! The moon roof & drain, windshield seal and the body seal between the firepanel and fender apron (car was in anccident but repaired)

Let us not forget clogged sunroof/moonroof drains, improperly grommeted wiring for aftermarket electrical accessories (radio equipment, extra alarms, etc.) corrosion in the floor or fender wells and leaky windshield seals.

3 possibilities,1-the air conditioner has a water drain off hose which could be blocked.2-the heater core could be leaking.3-the windscreen seal could be leakin-only wet when raining

the weatherstripping(the rubber stuff around doors, windshield and such)

i had this problem mate, check the door sill rubber for any holes as it will cause it to leak if not then take off your wing mirror an check the rubber sill behind it as this is a common source that is often over looked.i hope this solves your problem,good luck

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I had this problem on my wife's 1998 Chrysler Sebring convertable. It turned out to be the drain holes on the bottom of the chassis, under the door. The drains fill up with dust and dirt, then when it rains, it turns to mud and clogs the drain holes. I fixed it by using a paper clip, straightened out, and jamming it up into the drains until water ran out. It seems I've had to do this about once a year or so.

. I also had this problem on a Chevy Corsica. Turns out ther was a crack in the firewall so water running off the windshield that normally would be channeled down the body panel found its way into the car and settled on the driver's side floorboard. Once the crack was located, a little rtv sealant fixed it right up.

Could possibly be a leaking heater core as well!! Use a radiator pressure tester to pressure the system, if the pressure drops, look for the leak, or listen, some times leaks can be heard as escaping water/air.