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I am actually going this route when I put in my electric water pump, in vegas the possiblity of needing antifreeze is slim to none and it sure will help when the temp pegs 120.
I also agree with the others, are you sure its not an air bubble?
Antifreeze not only depresses the freezing point, but it also increases the boiling point. Not to mention its anti corrosion and lubrication properties. However, on the down side, antifreeze/coolant does inhibit heat dissipation through the heat exchanger, relative to water.
I read a web article a couple of years back, where the Redline water wetter, when used with the long life (pink) coolant would or could gel. This condition seemed to be aggravated by air in the cooling system.