[DeTomaso] Pressure Cap

[dickruzzindesign]

If you look at your radiator cap you will see two seals.  One spring and seal gives way on the defined pressure to allow coolant into the coolant recovery container.  The other seal keeps the system sealed to keep air out.  That allows the expelled coolant to return to the system when it cools and its volume is reduced.
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All the best, Dick Ruzzin.
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dickruzzinDESIGN at aol.com  /  Phone: +313-824-0539  /  Cell: 313-300-9558