Help please water leaking inside

I just bought a 2007 Ram 1500 Big Horn yesterday at a dealership and today I was driving it for an hr and went I turned a lot of water spilled outta the vents on the floor both driver side and passenger side , I don't know what part it is but the black thing under passenger side dash looks wet on the outside and dripping water , very mad to say the least just paid a lot of money for this truck and I didn't purchase a warranty what is the part called and what's going on please help thanks in advance it does leak when I don't turn had ac on full blast all day