Quote:
Originally Posted by old31
Other than increased boiling point, what is the purpose of a pressurized system.
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JMO: With a sealed system, there is a coolant capture tank that holds the excess coolant when the system is very warm. I think the 4# cap seals better to the top of the radiator and then is better able to pull the coolant back into the radiator from the capture tank as the system cools.
Good Day!
Dave in MN