What would you recomendmend to add to the radiator of Toyota landcruiser to fix a blown head gasket or cracker head?

Answer 1

Nothing. There is nothing you can add to the coolant that will repair a blown head gasket or cracked head. There are products you can use in an emergency to possibly get you home but these are just temporary fixes that will not last long. The only permanent fix is to open the engine up, replace the head gasket or head if necessary. STOP driving your Toyota immediately or you will have severe permanent engine damage.