Quote:
Originally Posted by Big hammer
Water wetter - anti- corrosion water pump lube
Ford recommended draining the antifreeze and using water for summer months!
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I think this was because alcohol was generally used as antifreeze and it evaporates out of the cooling system rather rapidly, since it has a lower boiling point than water. Topping off the radiator was a necessasry routine maintenance. A long trip in hot summer weather would rapidly evaporate the alcohol (about a third or more of the cooling system capacity) leading to overheating. So plain water was used in the summer.
When ethylene glycol antifreeze came into common use it was called "permanent antifreeze" because you could leave it in year around as it's boiling point was as high or higher than plain water.