AC Evap core drain on 05 Expy EB 4wd?

[bivenspack]

Now that we've been using the AC I've got water in the passenger side footwell. I think the drain may be clogged, where does in come out under the vehicle. I know it's somewhere at the front of the tranny tunnel but I can't see it. Any help?

 

[toms89]

Here it is a little to the left from the center of the photo on the firewall in a 1st gen expy. May be similar location in 2nd generation??

Pretty much behind passenger side head next to tranny bell housing.