Water flooding into the drivers floorboard?

Hello,

It sounds like the evaporator is draining inside of the vehicle.
The evaporator for the ac will accumulate condensation as the A/C runs. The condensation gets drained to outside of the vehicle by channels in the evaporator case. It sounds like there is a clog in the drain, which making the condensation drain inside of the car.

So you will have to get that drain tube cleaned in order for the water to drain outside.

You might find this video helpful:

https://youtu.be/q9_MZiS2_NE

I have attached diagrams for your reference.

Please let me know of any questions.

Thank you.