Water has a higher boiling tolerance than coolant in a closed system so either A. something happened to your 16psi cap, or B. Air was introduced into the system and your H20 pump doesn’t know what to do. Try idling the engine with cap off for 15-30 minutes with some manual revs and main hose squeezes. Head gasket issues are rare unless someone is driving in the red.
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- car boiling over with coolant in it