There should be a drain hose for the AC on the firewall underneath the evaporator, try sticking a straightened out coat hanger up the hose to clear any blockage.
The AC condensation drain is clogged, when the AC is on water is condensed on the cold AC evaporator core (this part is what cools the incomming air), this water drains out the bottom of the heater/AC air duct, the drain is at the bottom of the firewall under the hood on the passenger side, run a coat hangar up into the drain to clear it.
SOURCE: water on passengers side and back
Your AC drain is stopped up. You will probably have to access it from underneath the vehicle. Look under hood at the bottom of the evaporator,heater core housing and you will see either a black plastic tube or a rubber tube coming off of it. Take an air hose and blow into it and see if this unclogs it.You can try something like a coat hanger if this doesn't work but be extremely careful,you do not want to puncture a hole in the evaporator.
SOURCE: water in floor on passenger side
The issue is condensation from your air conditioner not properly draining. This is usually caused by a damaged, or clogged drain hose. The condensation is supposed to drain outside the vehicle by way of a hose on the firewall area.
SOURCE: Wet floor in car
the evaperator drain tube is plugged,blow air through tube to free obstruction,you gain access from the engine compartment on passanger side close to exhaust,
SOURCE: 2001 Mitsubishi Galant leaks water into passenger
The A/C evaporator drain tube is most likely blocked. If you have a V6, you're in for a real treat trying to reach the thing to clear it. The tube is on the firewall behind the driver's side rear motor mount, and slightly to the left as you're facing the firewall. It is a 1/2" diameter metal tube projecting about 1/2" from the firewall, and is covered by the firewall sound and heat blocking material which has to be folded back to reach the tube. A pair of what I believe are brake lines are one finger's-width in front of it, making it VERY difficult to get to the tube. (Brilliant design, Mitsubishi!) If you are very dexterous, you can slip a small piece of wire or a cable tie under the brake lines and into the tube from the front to try and clear it. Good Luck!
SOURCE: My Air conditioner stopped blowing
Water on the floor is generally caused by a plugged drain (located on the engine side of the firewall about opposite where the passengers right foot would be...small rubber hose, usually bend downward.)
It is possible that the evaporator may have iced up due to water in there but generally it should work again after it's been off and the ice melts. Also check the coolant level in tha radiator...the water could be antifreeze from the heater core.
Could also be that there is a control problem and the water has nothing to do with the malfunction itself.
Since the system is a bit complex, and most items are difficult to reach unless you have lots of time and a manual, probably better to have a shop do the work. There are many items you can do at home but heat and A/C unless they are obvious visible failures are something that most people including some techs have problems with.
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