Front passenger footwell, under the floormat, is always damp.
Haven't washed the car in 2 weeks so doubt it's a sunroof issue.
Any DIY videos out there on how to locate the AC drain tube? I suspect it might be cracked or damaged.
Strange thing is, it still drips water under the car near the front right tire.

 

I had the same problem of water on passenger floor. I thought it was rain. But when it happened during a sunny day, I knew it was the AC problem.

I could not find a video showing the ac drain tube location but here is a video of a evaporator replacement. At the 6:50 mark, it shows what the tube looks like. Using that as a guide, I was able to find the location on the firewall. I crawled underneath the car near the passenger side tire location. If you look up towards the firewall, you can see it. It is only about an inch long. If your tube is not 100% clogged, you will still get a couple of water drip marks on the floor. That will also give you a clue where the hose is located.

Once I found it, I could put my arm up towards the firewall and feel the tube. I put a plastic string from a lawn trimmer in the hole and wiggled it around. A gush of water came out. Problem solved. No more water on the floor.



https://m.youtube.com/watch?v=VuJASXZU1kQ

 

Thanks for the video!
It took some doing, but I found it just like you described.

So I've wiggled some wire in there, shot it with compressed air (3gallon hot dog compressor), and even shot some AC cleaner and it still leaks water into the carpet.
I'm guessing some leaves or small debris is shifting around and clogging the drain hole. One day it barely drips, the next it's not dripping at all after using the AC.

I'm going to try a stronger compressor this weekend. What a headache.

 

I had the same experience. The 1st time I poked a plastic lawn trimmer string into the hole, a big gush of water came out. I watched the water drip area for the next few days. I noticed that at times, it barely drips. But I repeated the process of poking an object in to the hole to unclog it. My latest invention is an Allen key because it is short and I can easily wiggle it into the hole. After a couple of repeated sessions, the dripping now is consistent after I run the AC.

You are probably correct that 20 years of dirt and debris have been collected in there. So it will take a few clearing sessions to complete the job.

I put an empty pie tray underneath my car to catch and monitor the amount of water coming out. After running the Ac, you can also put your hand underneath the dash and feel the plastic tank that holds evaporator. If there is water trapped inside there, the plastic tank will feel cold and damp due to condensation.

Good luck!

 

Appreciate all the info and advice

 

depending on where you are doing the work....but if you have access to a garden hose....

1. drop the glove box,
2. drop the blower motor, clean out any debris
3. remove the cabin air filter
4. shine light inside the opening and you'll see the heater core or ac evaportor ( forgot which one you'll see first, did this a long time ago) It doesn't matter, all I know was I remember seeing an inch of sludge on the bottom. I stuck a garden hose inside the box from the cabin filter opening and blast away at the buildup on the bottom. All that crap will drain out from the ac evaporator drain outside the car (this is assuming you've already cleared the drain from the outside) using compressed air from the outside will never get rid of that sludge that has built up on the bottom of the hvac box. All youre doing is just blasting a small hole in the sludge buildup. J
5. Put everything back together in reverse order when everything looks clean and water flows smoothly out. I can almost keep the hose running for short burst and water will flow out without issue through the drain. Barely made a mess inside, just a bit of water from turning on and off the hose

 

Appreciate your tips!
I removed the blower motor for better access as you suggested and used a new foam cleaner spray to clean out the evaporator. After 4 tries, I think I finally got it....I hope.

 

It has been a few year, but the water is dripping on my floor again. I am going to try your Allen wrench trick. You are right. We are trying to correct a problem in a 23 year old car. Probably full of leavers and gunt.

I found the same thing - putting my hand on the evaporator to test for stuck water inside. If is is cold and damp, there is probably water inside.

 

probably going to want to remove the housing and clean it out. when it goes back in put cabin air filters in it if it doesnt have any.