Quote:
Originally Posted by bobcowan
This statement caught my attention. The catch can on a modern engine does more than catch overflow. As the system heats up it expands, and needs a place to go. It ends up in the catch can. As the system cools, it contracts.
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Only if you are using the proper radiator cap. There are different caps for open and closed systems. You need to know which you have if you are counting on the system to contract and draw the contents of the catch can back in after it cools. Cap pressure ratings can also affect cooling as well.