Is there a way to evacuate air from a slant six cooling system?

Bewy said

Removing & then refilling a cooling system ALWAYS results in some trapped air. Fill the system & get the enngine up to operating temp. That will purge the air. Let cool down overnight & then top up the system. Repeat the process [ may take 2-4 times ] until you can no longer add coolant.

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With the coolant recovery bottle, I think the process that you described occurs automatically. Presumably, the engine heats up and expels trapped air through the rubber hose attached to the top of the radiator. When the engine cools overnight, the process reverses itself and any void created by trapped air is filled with coolant sucked out of the recovery bottle. I was just wondering if there is a way to speed up this process by somehow manually releasing the trapped air.