Where is the evaporation drain hose for the A/C located?

Often the floor of the passenger side become wet if the drain pipe of the evaporator is:
- Bent or twisted.
- Clogged or,
- There is any obstruction in its routing.
The drain pipe is a rubber hose about 14 mm in diameter, located just under the evaporator (cooling coil) casing on the passenger side.
The most easiest way to clean the pipe is to take it out, wash it from inside with water or to blow a compressed air slowly through its distal end while leaving it in place under the body.
Note: Keep your eyes away while blowing the air.
Hope that it works.

Your drain hose is clogged. If you park under trees, debris can get in there. Once the hose is clogged, the water has to go somewhere, so it goes onto the passenger-side floorboard because that's where the evaporator is (under/behind the glove box).

a couple things to look at if it has a sunroof the sun roof would have drain hoses that run down in each corner next you need to look at the cowl this is the section in front of the windshield that has a drain on it as well if you find nothing there the next step would be to remove the seats and carpet and sit in the car while running water over it either way you should remove the carpet and make sure it is dry all the way threw or mold will start to grow and you will never get ride of it not good for your heath other key spots to look at is if the windshield was ever replaced it could be a poor seal

I have the same problem and can not locate the hose either...it maybe intergal to bottom of plastic air conditioner inside cab on passenger side,,,,,bad design!

Likely the drain hose for the A/C evaporator. Should be low on the passenger side firewall (looks like a little right angle stub hose if it's a v8, probably can only see it from below.

The problem is with the evaporator drain. There is a, (usually soft flexable), tube that drains condensation from the evaporator to the outside. It is located in the passenger compartment, under the dash. The hose has, (A)-became disconnected from the evaporator. (B)- Has gotten a kink in it. (C)-Became clogged, causing the evaporator to overflow into your passenger floorboard. Your vehicle probably has some covers over these components, you will likely have to remove. Locate the hose, it typically drains just behind and inside your right front wheel. It may be concealed behind a kick panel, or may go thru the floor or firewall. You must find it and follow it to the evaporator and make sure it is not clogged or kinked and is properly connected to the evaporator.

Jacked up or on a lift or over a ditch look at the car from the buttom after the air has been run some. on the passenger side coming out of the firewall will be a rubber hose with a pinced end pinch it the other way than its pinced and let the water out ( it can be a gallon ) once drained put an object in the hase Ink pen Finger and clean it out (mold) and it'kk be back to normal and the other is its pulled off. Pull the carpet back fro, the top on the passenger floorboard and look with a light to see whats happened

Your drain hose is under towards the bottom of the car, up against the firewall. You may be able to blow it out from the cowl. You may just have to do a fresh air service which is a special foam that kills the bacteria and such that builds on the evaporator from it sitting.

pull up the carpet and locate the spot from the ac drianage duct insde the car, check for any holes in the floorboard or firewall and reroute the hose out side the passenger compartment, thru the fire wall it may have a rubber grommet covering the hole in the firewall, which can be removed to put duct hole thru.

Plugged drain tube.

Check under the hood, on the firewall, passenger side. Tube comes off the bottom of the evaporator housing (this is the box where the a/c lines enter the firewall). Usually a rubber tube that directs condensation from the evaporator housing to the outside. This tube often plugs with dirt.