in all my experience working on gm cars iv never had one "just get air in it" if there wasnt a problem. Personaly if it was me a would search around for a "block tester" and purchas one to keep on hand. There usualy like 60 bucks and comes with a tube u stick on ur coolan t bottle and fill with blue fluid. Next with engine running u suck air through the bottle with supplied pump and if there is any combustion gasses in ur coolant the fluid will turn yellow.
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The dumbass that shows up randomly 10 years after selling the car.
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