Overheating issues

RustyRatRod said

To say a system is not vented when it has a pressure release cap simply isn't true. The pressure valve on the cap IS the vent. As for the overflow tank, the same applies. If it has a pressure release cap, it IS vented, it is just NOW an extension of the radiator tank

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The radiator cap is vented no argument there.

BUT... If the overflow bottle does not have a vent or a pressure cap then the entire system is no longer vented.

On top of that, if the overflow cap is a pressure cap at 16 lbs and the rad cap is 7 lbs the system is 16 lbs