Posted by Sprint 6 on April 29, 2018 at 06:24:13 from (107.77.85.27):
First chance I have had to respond to my detractor regarding my post on why the coolant level raises in a 5.3 coolant tank when the pressure cap is removed on a hot system. It occurred to me that some individuals may not understand what is happening in a closed cooling system when the coolant is heated under pressure. The average system has a 16psi cap, which effectively makes the pressure on the system 30.7psi, give or take (14.7 atmospheric + 16psi). This is done because raising the pressure on an antifreeze/water mixture raises its boiling point. We all know that a heated coolant mix expands. The pressure exerted on the coolant by the sealing of the system also controls the coolant from expanding as much as it would at atmospheric pressure. So, when the cap is removed while hot, the coolant immediately expands to its natural state at atmospheric pressure based on its temperature, and will also immediately boil if the coolant is near its boiling point at atmospheric pressure. This is why it is not recommended to remove the cap from a hot system, as the expansion and boiling can cause scalding. Hope this helps, and saves someone from severe burns. Had a friend that had major burns from a radiator incident, it's not pretty.
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