Airconditioner daining into the passenger floor how do I unstop and locate the drain tube ?

Sometimes you can unstop the drain hose with a coat hanger.

Ok well had same problem. The drain hose is blocked and is backing up and coming out of top of drain plug and tube into the car so the tube hanging down in engine bay left side of motor may be blocked with mud dirt or something else so check it and with aircon on if the water is not dripping out of the drain tube then it is blocked

check the tube alinment make sure its connecet n theres no holes in tube

Bulletin No.: 03-01-39-011B
Date: November 22, 2005
TECHNICAL
Subject:
Water Leaks Into Passenger Compartment Through HVAC Module Condensate Drain Tube When Parked on Incline/Uphill Position (Install Auxiliary Drain Tube Extension)
Models:
2003-2006 Saturn ION Sedans and Coupes
Supercede:
This bulletin is being revised to include the 2005 and 2006 model years. Please discard Corporate Bulletin Number 03-01-39-011A (Section 01 - HVAC).
Condition
When vehicle is parked on an incline with the front end up during a rainstorm or when driving uphill during a rainstorm, water may leak into the passenger compartment through the condensate drain tube opening of the HVAC module.
Cause
Water may drain out of the cowl drain, then drain down the front of the dash panel in the engine compartment and seep into the HVAC module condensate drain tube opening. The water then collects in the heater core cover and upon acceleration may leak into the passenger compartment through the heater core cover seams.
Correction 1. Open the hood and locate the HVAC module condensate drain tube in the engine compartment on the right side of the dash panel.
Important: During installation of the auxiliary drain tube, do not make contact with the HVAC module foam gasket located at the base of the HVAC module condensate drain tube. If the auxiliary drain tube is pushed on too far and makes contact with the foam gasket, water may leak into the passenger compartment.
2. Slide the auxiliary drain tube onto the HVAC module condensate drain tube and make sure that the auxiliary drain tube is angled downwards after installation.

Its the evaporator case filling up with condensation. Its caused by the drain tube being clogged. If you raise up the passenger side of your car and look at the bottom of the heater case you will find a rubber tube hang down. If you take a pipe cleaner and wiggle it into the tube and clean it out it should drain.

sounds like it check the a/c fluid drain for any restriction, or leaks

look for a small tube under the motor on the firewall and unplug it

the a/c box has a vent in bottom to drain out condensation it is plugged under car is tube hanging down try flushing it out or open bow and clean out, rain leaking in maybe loose duct in dash

if you look back on the firewall directly behind where the blower motor is located then you should see a tube extending down towards the ground. This is the evaporator drain tube.

sounds like a stopped up drain tube. probably will need to take to repair facility so they can use compressed air in drain tube to unstop it. Hope this helps.