To prevent gunk formation and other problems, a DEX-COOL system should remain filled with the appropriate amount of DEX-COOL, rather than excess air. However, some have expressed concerns about opening the system:
I dont want to keep opening the radiator or resivoir to check and be letting air into the system!
Consider a leak-free system in which the DEX-COOL is about an inch below "full cold," but at least an inch above above the surge tank's coolant inlet. Should the system be topped off, or is it best to avoid opening the cap?i don't remove my rad cap for nothing [and let air in]