I crawled under mine - the hose you refer to IS the condensate drain. check to make sure your compressor is not staying engaged - its the lowest pulley on the drivers side of the engine. It is engaged when the center is spinning with the outer belt track. ANYTIME that compressor is spinning it will make condensate. If its staying engaged even with the system off you have a trip to the dealer to consider! It should engage when either AC is selected (with fan on) or DEFROST is selected (with or without fan on).
J Wm Bishop EA, ASADE
The world is made from rocks and mud. Maturity is knowing when to stop playing in the mud...