Quote:
Originally Posted by FvnnyL3tt3r1ng
Coolant reads boiling point of 262F (ignoring innacuracy of gauge)......
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Could you explain how/where/when did you read that?
http://www.arrowheadradiator.com/ove..._and_cures.htm
I don't think that the coolant is the problem, but the ratio of releasing heat.
Your engine is generating more heat than what the radiator can release into the atmosphere.
As your cap is holding some pressure, that coolant is not reaching the boiling point yet (high pressure = high boiling point (around 3 more F degrees per each psi)).
If you want to experiment, just switch to distilled water, which has a greater heat transfer capability.