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Originally Posted by g2ic02
try replacing the hose that runs from the top of the radiator to the over flow. It sounds like when the coolant gets colder, the vacuum created by the contracting fluid isn't pulling in coolant from the overflow. If the hose is cracked air would be the only thing going back into the radiator.
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I'm pretty sure coolant only comes out, not back in. When the pressure goes down, the plunger on the cap will go back down as well sealing off the coolant tank from the rest of the system.