Those 'quick release' caps where invented for use on those old cars that did not use the overflow bottles.
The radiators were like ours, in that they had a top tank. But, those cars were designed with BIG tanks (like my '65 Fury), and you leave an inch or 2 or air on top.
As the pressure builds, the air compresses (water does not), and they only over flowed when there was a problem, or, occasionally, when it was "extremely" hot outside.
You could release the pressure safely with the lever because of the air on top.
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Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing.
TEMS, and some nice MODS. Sold to a friend 10/08/08.
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