1993 Toyota Corolla Dx: driving over labor day weekend, had the AC on for longer than i've normally had it on and noticed water on my passenger side floor mat. Then i looked and it was leaking from underneath the dashboard from the back side of glove box (opposite side the compartment opens). It smelled clean and was just water. I'm guessing the water pump is leaking. Not sure what else it could be. It wasn't doing it with the AC off.

The drain on your evaporator core housing is most likely plugged. Condensation on the evaporator core drips down into the plastic housing and drips onto the ground through a hose on the firewall on the
passenger side.

Find the small hose on the firewall in the engine compartment. You should be able to pull off that
hose and see if its stopped up. If the hose is ok, you may need to remove some of the ac ducts
under the dash to get to the evaporator core housing to unclog the drain hole.

I have no doubt that thats the problem.