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Yes. The cap should also allow a warmed up engine to draw in coolant as the thermostat opens, when pressure starts to build from the heated water it closes the valve in the cap and holds pressure.
a warming engine expands any air in the system, when the thermostat opens, the engine gets a big "gulp" of cold coolant, which will cause any trapped air to contract and pull a slight vacuum on the entire system.The cap seals the system to the overflow tank and when that cold gulp occurs the vacuum it creates pulls coolant from the overflow uilds as the hose is submerged in the overflow tank.Once it does, pressure builds and causes the cap to seal the valve to the overflow, as now all the water in the engine is warming. Its a vicious cycle. LOL
 
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