Quote:
Originally Posted by GregMN
When the pressure in the system is greater then then vent pressure of the expansion tank cap, the cap vents it. We both know that. My point is that the cap vents based on the pressure in the system, not the temp. of the coolant in the system.
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Since we both know that the cap vents excessive
pressure in the cooling system and we both know what happens to coolant when it boils, you statement is fundamentally obvious.