leaks water when heavy rain into passenger side floor back seat

Is the leak coming from around the rear window some where and the water finding it's way to the floor? When this happens again try to observe it closely to see where it's coming from, usually when water leaks through seals you can either replace the seal or seal it back up with some sicaflex type glue, but make sure the glue has no acid agents in it, or it can promote rust.

YOUR PROBLEM IS NOT THE DOOR SEALS!! GO UNDER THE HOOD , TO THE RIGHT SIDE OF THE FIREWALL WHERE THE FRESH AIR INTAKE IS ON THE HEATER BOX. TAKE OUT THE 4 SCREWS & RESEAL VENT. I'VE FIXED 6T/C WITH THIS PBLM. SID @ FANTASY LIMO CHGO.

The water leaks into my Lincoln on the floor in the back seat. Will resealing the fresh air intake on heater box help even when it is in the back seat flooring? Dan