97 Cab taking on water

[Beer, Jerald]

OK, I think I have a clogged a/c drain valve. SO says water soaked front
passenger side floor/mat the other day.  a couple of days later, water
dripped down drivers side. confirmed it was cold water. a/c has been running
here in south Florida. assuming clogged a/c drain, where is it?? do I need
to get car on lift, or do I peel back carpeting  under dash  and attack it
from  there? TIA
Regards.
Jerry
91 200qa 
97 Cab (glub glub)