2008 Pontiac Grand Prix AC condensation drain tube location?

I have a 98 Pontiac Grand Prix. I have been running the AC a lot and have been hearing water slosh around under the dash. Typically a puddle will form when the evaporator pan is draining properly, but in this case no puddle but the AC is working great. I have tried to locate the drain tube thinking it might be clogged but have no luck in finding it. Can you tell me were the tube is located or is the condensation taken care of by some other method that is not working correctly?