Water on floorboards

Sit inside while someone sprays water from a garden hose. In particular, watch on the firewall after pulling the front of the carpet back, and watch under the doors. Don't overlook the air conditioning drain tube under the hood on the firewall. Be sure it isn't plugged.

Your going to have to water test the car meaning your inside the car siting in the seat while someone sprays water over the car. If you can't see it that way then you will have to stand on your head while looking under the dash for leaks while the water is spray over the car. It's no fun at all I fixed more then my fair share of water leak's.