What is the box that sits under the battery tray. There is a vacuum hose that connects to it and I have no clue where it goes. Looks like something for the cooling system as I see it dripping. Any help? Will try to post pictures later

 

I have a 2004 pacifica 2WD

 

 

BATTERY TRAY
DESCRIPTION
The battery is mounted in a molded plastic battery
tray and support unit located in the left front corner
of the engine compartment. The battery tray and
support unit is secured with three fasteners, Two are
located directly under the battery and the other is
located on the right side of the tray.
The battery tray and support unit also includes a
drainage hose, located in the front of the unit.

Hope this helps

 

So basically it's a drainage hose.. Hmm never seen that before... I think so.