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I can see where work is coming in, i am going to i guess take off door panel and do a look see, not sure what else to look for
Since the water is getting onto the seat this means it has to be from a high area. This means its coming either from around the glass seal or door seal. Often these seals get hard and can not create an air tight lock. Also the door hinges can get weak and the door not seal well enough because it is sagging. I suggest you sit in the car and have someone soak the car with a hose to determine exactly the location its coming in so you are only buying one seal and not experimenting with numerous ones.
the leak is coming from bottom, water is not getting on seats, just pooling up on back floor
Sorry I misunderstood your question.
Every time it rains, driver side back seat and drivers side floor gs real wet, help me the car is a 2002 Lesabre custom. The water apperars to be coming in from back drivers side door near the I believe you call it a C-Pillar,
Since it is only getting on the floor you need to verify the water is not coming from the front and following the channels in the floor to the rear. The best way to diagnose this is with someone inside the car and someone outside using a hose on all seal areas.