I was driving along and could hear something sloshing and when I looked into the passenger side floor I saw what looked like some sort of liquid. After an investigation, it turned out to be water. I pulled the carpet back and the metal floor pan was completely flooded and or course the padding was soaked. I removed the foam floor block that covers the battery compartment and the battery compartment well was full of water. I vacuumed the water from the battery well/floor pan and discovered the AC drain line was clogged and running over into the battery well and floor pan. When I separated the AC drain line, more water flowed into the battery well. I used an air compressor to blow out the drain line and placed a heat lamp in the area to dry the padding. The drying process has taken about 24 hours and you can bet I will check this more often as I live in Florida and the AC is used every day. BTW, the car has 158,200 miles and it was never checked. Lesson learned!