Well, since the evaporator (cold thing) is inside the cabin and the water (condensate from blowing warm, moist air over the cold thing) needs to go outside the cabin, I guess it is technically feasible that you could possibly touch the drain line from inside the cabin, but what you need to do is find it outside the cabin and make sure its dripping when the AC is running. If you have water in the passenger-side floor when it hasn't been raining but you have been running the AC, it may well be plugged up or kinked during assembly like TD's. In hot weather, you typically will find a patch of wet pavement under the car where it was parked after driving it. This probably is enough evidence that it is dripping. My driveway slopes up, and anytime I drive up it after using AC, and then get out and walk back down to the mailbox, I'll see a line of water where it dripped faster going uphill, which is all I need to see to know that the water is draining out. You have to figure out your own clues based on your situation.
2017 Sportage SX AWD