The AC lines in my car are clogged, and the back floorboards are getting flooded as a result.
This is a common problem on vehicles. One method of repair is to use compressed air to blow through the drain tubes, from the bottom, to clear out debris. The heater/AC box may need to be accessed and/or opened, to clear any obstruction. You may want to enlist the help of a mechanic, such as one from YourMechanic, who will have the tools and training to inspect your AC system, and clear out the drain tubes.
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