it has a cracked head
The above answer would be an extreme condition to cause this problem. Usually a car overheats because of either low coolant level or a stuck or bad thermostat.
Low coolant, inoperative radiator fans, stuck thermostat, failed water pump, restricted radiator, head/headgasket.
pot
replace your radiator cap...
Can be the thermostat which is cheap to replace, or it might be the head gasket which is expensive.
It could be low on water and stuff, fill it.
Engine overheated. Possible causes are: Thermostat stuck closed. Low of coolant. Defective radiator cap. Clogged radiator. Defective Water Pump.
Engine coolant temperature is cooled by the radiator, moved by a water pump and controlled by a thermostat. If there are troubles with any of those components the coolant will boil Also if the head gasket goes bad gasses from combustion inside the engine will get into the coolant and cause it to boil.
Stuck closed thermostat or a bad head gasket.
Thermal inkjet printer causes ink on print head to boil.
you boil it
Water under pressure has a higher boiling point, if the water is already hot enough to boil it will suddenly erupt when the cap is removed and pressure relieved.
my stomach is boiling what are the causes?