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Originally Posted by purple gas
so, does that mean when the prerasure valve in the cap closes, and the "coolant" cools down there is a negative preasure, or in essence a vacume within the system?
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Yup - so depending on how you visualize it, either the vacuum within the system sucks the coolant out of the overflow tank, or - when atmospheric pressure exceeds the pressure within the system, it (atmospheric pressure) pushes the coolant back into the radiator. Same difference.
