> A system at 15 psi and 50/50 mix will go to about 265 degrees before it will boil. Im thinking the system reaches 15 psi long before the water gets to 265.
John, what keeps the cooling system from boiling over at, say room temperature? It's pressure. Water will boil at room temperature in a vacuum. In an un-pressurized cooling system, atmospheric pressure keeps the coolant from boiling. In a pressurized system, the atmospheric pressure plus the additional pressure imposed by the radiator cap prevents boiling.
Boiling occurs when a liquid's vapor pressure exceeds the ambient pressure. For straight water at sea level, that happens at 212°F. And as you point out, a mixture of antifreeze and water at 30 psia (15 psi atmospheric pressure + 15 psi radiator cap) boils at around 165°F.
Now you mention expansion. Coolant is relatively incompressible and expands with temperature. So as the engine warms up, expansion will cause the radiator cap to open and vent air and/or coolant. In an older style cooling system without coolant recovery, the effect of coolant expansion is negligible. But if you're talking about a modern system with coolant recovery, you're right, the radiator cap pressure will be reached at a below-boiling temperature because there's no place for the coolant to go other than out the radiator cap.
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