WHY THEY SAY BLOWN HEAD GASKET?( overheating essue ) CONFUSING BAD HEAD GASKET

This video tutorial shown on how to diagnose the overheating problem done by blown head gasket.
the trouble is can be diagnose by observing the movement or behavior of the water inside the radiator. it will simplify the cause by seeing the water pressure inside the radiator.

#blowheadgasket
#overheating