You don't see drain hoses getting clogged very much these days since they started putting cabin air filters in vehicles, but I could see one getting disconnected or kinked. Best I could find is a picture of the cooling unit, which shows the drain hose, part code 92590, and you can see the drain port on the case in the picture as well, which appears to be just ahead and to the left of the blower fan.
http://www.nissanpartszone.com/Page_Pro ... e=271_A002