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the overflow tank is to hold and to replace the coolant due to thermal swelling.

so when cold, the overflow should have a little in it, but when hot the level will increase.   then as the system cools down it will suck from the overflow.   If the overflow was too low when cold it could then suck air back into the loop.

(drawing is showing near full when HOT)

also, that illustration is the factory recomended arrangement.   I think the vent from the pressure tank to the radiator was a Service Bulliten.   In my opinion not a vary good way, because in air that makes it to the pressure tank will be vented to the top of the radiator.  I guess the thought is there it can be vented with that upper petcock.

and another opinion, air bubbles tend to go upward, so to get air out of the loop by venting at the top radiator, the front of the car needs to be raised

 

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