Re: 2005 Moisture on Passenger Compartment Floor
Cabin air filter was replaced last week, as I was adding the rubber "top hat" to the shroud to make sure water wasn't coming in there.
I checked last night, and with the air on, the vent was blowing cold air. In addition, a used a screw driver to check the vent, and could not detect any blockage.
I did notice the foam seal between it and the firewall is soaked on the firewall side. My hunch is that water is coming out the drain, then running back up against the foam seal (especially at speed with the wind blowing) and coming back into the compartment. To stop this, I used some putty on the outside of the vent to help seal the tube to the firewall.
I will run the AC longer to see if water is draining from the vent. My friend with the same problem says his is draining from the tube.