The addition of anti-freeze to the engine coolant mixture not only reduces its freezing point, but also
raises its boiling point. However, because the heat transfer of ethylene glycol is significantly less than that of water, there's a point at which higher concentrations become counter-productve.
The chemistry/physics of it are anough to give the layperson a headache, but for the sake of argument, let's consider
SL Vol. 14, No. 14. Packard even recommended increasing the concentration of anti-freeze (specifically, Prestone) to raise the boiling point for unusual operating conditions - but NOT beyond 60%.
Pure antifreeze would actually contribute to overheating.
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