Firewall/Under Dash Water Leaks

Drivers side just remove the vent box, passenger side remove the whole heater box to get up there.

In 1977 my wife was driving one of our 70 Darts in cold rain in traffic. The damned pivot seal leaked onto her foot and when she looked down the car in front of her slammed on the brakes - Grille, bumper, radiator, valance, hood, plus the damage to the other car - (((sigh)))