Several problems involving radiator or heating system. Car overheats after 15 minutes of driving. Hoses have been replaced 1 year ago. Thermostat replaced three months ago.

Water getting into floor of vehicle. You can hear water running. Are these problems related?

When you say water on the floorboard is it coolant or is it rain water?

One is a bad seal on a door and the other would mean a heater core has ruptured. Which after redistributing the coolant from the cooling system to the floor, could cause you to overheat.