I'm guessing the right rear door seals are worn or rotted. This is pretty common on twenty year old cars like that. I'm surprised all the door seals and maybe the front & rear glass seals haven't been leaking, as well.
Yep door weatherstripping, door drains plugged and if it has a sunroof those drains can also plug up.
WHEN IT RAINS I GET STANDING WATER IN MY PASS. REAR FLOOR PAN AREA. NO OTHER AREA OF CARPET OR HEADLINER IS WET EXCEPT RH RWEAR FLOOR PAN CARPET.
2003 Lincoln Town Car Signature Premium
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Maintenance & Repair
After heavy rain, water accumulates under the head liner of the inside of the car. Pours out onto the seats and floor board.
2007 Lincoln Town Car Signature
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Maintenance & Repair
water on rear passenger side floor.
2004 Lincoln Town Car Signature
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Maintenance & Repair
Water in rear drivers side floor every time it rains
2004 Lincoln Town Car Ultimate
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Maintenance & Repair
The floorboard is wet even on sunny days and only on the passenger side?
2005 Lincoln Town Car Signature
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Maintenance & Repair
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