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Add coolant to max level, close expansion tank cap.
Start engine, set climate control to max hot.
After a couple minutes, slowly loosen the bleeder screw located on top of the coolant expansion tank and keep loose for a few seconds until a bubble free stream of coolant spilling is seen, then tighten.
May repeat this procedure once or twice/until no air bubbles are seen with the spilling coolant from the bleeder screw.
Use a thick absorbent cloth near the bleeder screw so you don't spill coolant onto engine bay.
I personally would not run the engine with coolant expansion tank cap open. The bleeder screw is meant to be used for bleeding the coolant system.
Hope this helps!
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