antifreeze has little to do with the boiling point protection. the cap does that. higher pressure caps boil water at a higher boiling point.
PURE water will boil slower than water with antifreeze in it.
the water wetter products reduce the water particles and make it absorb heat faster... keeps the motor cool.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!