There are no drains in the floor. If there were, snow, rain, and mice could get in. What you likely were told about is the AC condensate drain. The cold evaporator in the dash removes humidity from the air as it cools it. That water condenses and drips into a pan, then onto the ground through a tube through the firewall. That tube can become blocked, then the water backs up until it spills onto the floor, usually on the passenger front floor.
The AC also runs in defrost mode to remove that humidity so it doesn't condense on the cold windshield and cause fogging. Look under the hood on the passenger side of the firewall for a 4" rubber hose with a 90 degree bend in it, hanging down behind the engine. Squeeze the end of it to open it up. If nothing comes out, there's a wire ring you can squeeze to pull the soft hose off, then carefully stick a pencil into the tube to dislodge any debris.
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Wednesday, November 27th, 2013 AT 12:47 PM