anybody know what hose connects to the port on the bottom left?

 

If memory serves me correct it runs towards the front of the van to a piece mounted to the radiator support that has another vacuum line and an electrical plug on it.

 

not sure what is is called, but on my 06 3.8L
it runs next to the air box infront of the windshield fill tub and connects to a small black cylinder under the front top radiator support just before the rad fill cap (so between rad fill and washer fill)