Under the hood there is a pipe that is broken from the blower motor

To the left of the engine, what is the part that is connected to it that I need to replace? It is to the left of the engine, close to the edge of where the hood is. The pipe comes out of some part I don't know makes a sort of U-Turn and connects to a metal wall of some sort. The coolant container is empty if that helps but I don't know if that is because I never changed it or because of the hole in the pipe. The truck runs but not as well as it should.