A radiator is a heat transfer device that allows air to pass freely over fines that conduct heat from liquid circulated within an engine to cool it.

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Is it necessary to run the engine after adding radiator coolant or only when draining?

I recently did a timing belt/water pump change on my own. When I changed the water pump i drained the coolant, and according to my mechanic, I blew my radiator by not running the engine with the cap ...