Comparing 16 PSI Radiator Cap to Carbonated Soda Can Pressures

Every pound of cooling system pressure adds 3 degrees to the boiling point. 15# gives you an extra 45°. It gets hot and vents but it really geysers when you loosen the cap. All of a sudden your boiling point goes from 257 to 212 in a second. The coolant was at 245° :BangHead::BangHead::BangHead:

Co2 builds pressure inside a pop can, boiling water inside a radiator. Other than pressure inside a closed container, neither are similar.