Over flow tank?

Scott_B said:

So it will get sucked back in, and i dont have to add more water wetter! Thanks!

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Yep. The coolant is always circulating, but is slowed and controlled by the T-stat. In order to prevent hot spots and to keep emmisions levels to a minimum, the coolant and pressure must be regulated. All that cannot be sent though the system must go else ware, hence the need for an overflow jug. When the demand for the coolant to circulate is called upon, the thermostat opens and the coolant is again drawn from the overflow tank and circulated back into the engine.