Re: leak onto floor passenger side from neck of ac drain...
It's not your heater core. If your heater core is out it would leak antifreeze. My wife's 97 Grand Cherokee had the same problem. It is condensation from your AC coming leaking through a round hole in the AC unit at the firewall. Pull the carpet back and dry out underneath it, there will be a lot of water and we had to leave the carpet pulled back with a fan blowing on it all weekend to dry out. I fixed this about 8 years ago so if I remember correctly, the was a plastic part of the AC at the firewall that had a hole in it that the water was coming out of, I could see leaves and debris in the hole so I know it was part of the drain system. I cleaned out what debris I could and used a cone shaped peice of rubber and twisted it in to plug the hole and tapped over the plug to ensure that it wouldn't back out with vibrations, etc. After you dry everything off start the engine and turn the AC on max, you'll be able to see the where the water is leaking from after the AC gets cold. Hope this helps, it drove us nuts for a year before we figured it out and the wet carpet smell wasn't pleasant.
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You probably have two different issues here. The water on the floor is usually caused by a drain tube being stopped up. The tube is supposed to let the water drain out of the car and onto the ground. It should be on the bottom of the firewall or below the floor. You would need to have the computer scanned for trouble codes to find out why the check engine light is coming on.
I had the same problem with a 1994 Taurus. Within the front fender was 10 years of pine needles and leaves blocking the drain backing the water up in and over the fire wall and into the front passenger seat floor. I took a LONG pair of needle nose pliers threw the passenger side door, and was able to remove enough debree. After pulling out out about 5 fist full's of yuck, 1 gallon a water that was stuck some where poured out flushing out the drain. I did the same on the drivers side. After that I had no problems with floods. I hope this helps. If not check your back door weather stripping if you have one. I have heard water leaking behind the passengers seatbelt and onto the floor from under the seat. Got to love Florida's rain season(s)
The a/c evaporator has a drain tube that allows moisture to drain out of the car. The tube will stick down on the lower, passenger side of the engine just in front of the fire wall. You can usually only see it from below the car. Sometimes these drain tubes can get clogged with leaves or other debris from the road which doesn't allow it to drain so it backs up and leaks water onto the passenger side floor. Try to locate this drain tube and clear it out. Compressed air works pretty good for this.
There is a drain on the bottom of the firewall on the passenger side most likely, check that drain and make sure it is clear. What you are seeing is the condensation from the AC coil when the AC is working.
drill a hole through the floor as a quick fix ,if it gets in let it out ,then check for the leak ,try under the firewall where the AC drain pipe is ,it could be the same pipe for drain water coming in from air intake vents
In the dashboard,set down low is a driptray.It collects water that comes off the aircon.It has a hose (sometimes 2) that drains the water out of the car via the firewall so it drips onto the road.This is blocked or the tray has a buildup of gunk.The hose is about 1/2 inch thick.If you lay on the floor where it leaks with a torch you should find it.Or look in the engine bay,just to the left or right of centre(which side leaks?)and backtrace it into the car.You may find the inside hose has fallen off allowing the water to drip inside.Hope this helps you
Did you have the windshield replaced recently? This is typically caused by faulty installation of a windshield. Sometimes it can be fixed by adding windshield sealant (polyurethene, not silicone) where the windshield is adhered to the subframe - most likely along the bottom edge.
there is only one thing that leaks water there, that is the AC condensation drain, water forms as part of the AC cooling the evaporator core, this water must be drained away or it will flood onto passenger area, so there is a drain on the passenger side at bottom of firewall, will leak allot of water depending on how humid the air is.