ok so the wheel well tube is the drainage for the base of the front windshield. The AC tube on mine is hard to get too, its closer to the driver than passenger and its way up on the firewall and not reachable from on top, underneath, there are lots of panels and such that block access as well. I have not had to use mine much as its been just warm and dry here in So Cal, but yesterday at the dealership I left the front doors open and the AC running and the water was pouring out from underneath, as it was a more humid day. I am guessing you will need to stop by your dealer and ask them to just clean out the drain tube, I would think it should be simpler if they can get it up on a hoist.
I'm a new on this site. I have a 2006 Lexus GS300. I'm having the same problem stated in here - a bad water leak on the front passenger floor board. It gets so bad you can hear the water squishing around when I stop. Where is this evaporator hose? How do I get to it to clear it out? Can anyone post some photos on how to do it yourself? Or instructions on how to fix this problem yourself? Thanks.
You would have to be able to get the car up off the ground to get at it, its up higher on the firewall closer to the driver side. Mine seems to be working just fine, but if your hearing the sloshing I would see if you could get at it and hit it with some compressed air to push the blockage out of the way. If you cant then just take it to the dealer or repair shop the cost would be minimal compared to the cost of the damage and mold etc that you will get by letting this go any further.