Leak from under MiniVan

This is a 1996 Dodge grand caravan 3.3 l
There are 2 small metal pipes under the right side of the van and one of them is leaking water. The pipes are going near the right rear tire to the front of the Van where I do not know, it seems it is going up to the engine area and then to the driver side area. I know once it stops leaking and I pour more water in the radiator it leaks again. I'm thinking it has to do with the heating and cooling system.