[Phantom]

If I see one at a junk yard I will just say its a coolant overflow tank LOL.

Does anyone have a diagram of how its plumed an how the wiring is ran.

I figure that with a few controlled valves I could place it after my cars water pump at the elbow that runs to the Lower Intake Manifold allowing me to open the tank when starting using the pump to push the coolant out. Then close the tank and circulate the exiting coolant from two tees with one way valves in/after them allowing me to fill it with hot coolant. Or something along those lines but I'm not exactly sure how the Prius runs the system.