I have had problem with the floor on my 04 focus Cmax (75,000 miles) getting absolutely soaked. This happened during the summer months and had nothing to do with rain etc. I have now solved it and thought I would post the remedy for others. The problem was a blocked drain tube that runs from the Air Con to the outside, because we have the air con on all the time a jelly like substance had blocked the tube and the water was building up and coming out of the fan blower casing. You can tell if you have the same problem because the floor will be absolutely soaked and normally if you have the air con on clear water should drip about a foot in from the off side front wheel if it doesn't then it is most likely blocked. The good news is it is really easy to fix. Kneeling down outside the car and looking in at the drivers side pull away the thin plastic panel that laps over the carpet in the foot well, on the C max there is a single central push stud that holds it in place. Just behind the panel at the same level as the driver pedals( possibly just covered by the top of the carpet) is a black rubber concertiner type tube about 5 inches long and half an inch wide. The bottom goes into the drive shaft tunnel and the top into a black platsic elbow. Pull the elbow out and the grommet style connection into the drive shaft tunnel They come out easily both being a push fit. Clean out the tube and fish out the crap where the elbow pushes in. Reassemble and Ah Voila!