* Cracked cylinder head: A cracked cylinder head can also cause exhaust gases to leak into the cooling system, with the same effects as a blown head gasket.
* Faulty thermostat: A faulty thermostat that is stuck closed will prevent the coolant from circulating properly, which can cause the engine to overheat and boil.
* Radiator cap not sealing properly: A radiator cap that is not sealing properly will allow coolant to escape from the system, which can cause the engine to overheat and boil.
* Low coolant level: A low coolant level can also cause the engine to overheat and boil, as there will not be enough coolant to absorb and dissipate heat from the engine.
