2008 Toyota Yaris AC drain not working?

During a 900+ mile trip from the desert to the ocean and back water dripped from the dash onto the passenger's side floor and we began to hear a "hissing or swishing" sound from the vicinity of the air conditioner during hard turns. I have looked into the drain pipe from under the car and have taken out the glove compartment and removed the covers from the ac unit until I can see the fan but so far see nothing obviously wrong.