07-26-2013, 02:47 AM
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CC Member
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Join Date: Jul 2010
Location: McMurray,
PA
Cobra Make, Engine: Superformance #522
Posts: 528
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Not Ranked
The coolant tank exists to provide a filling point and a means for air to escape out the system. Otherwise, air would trap in the radiator, since its not the high point.
The overflow tank is just that, a tank to catch overflow coolant so it doesn't spill out onto road surface. The valve is used to drain the overflow tank so it doesn't push out the weep hole. If coolant pushes out the weep hole you are probably overfilling the system. Only need to fill the coolant tank halfway.
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