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There can be several reasons for a boil over condition. 1. low or insuffecient coolant. Anti-freeze protects from boil over too. If the level of coolant is low or does not have enough "antifreeze" in the mixture, the boiling point is lowered. 2. thermostat is not opening or not opening enough. A thermostat must be installed, however. If the thermostat is not installed the coolant circulates so fast that the radiator does not have time to remove the heat and boil over results. 3. insufficient coolant flow. Blockage from thermostat, debris in the radiator or a condition called electrolisis. This is the hard white scaley stuff that you may see inside the radiator that is the result of the coolant flowing over the different types of materials in your cooling system. Regular flushing and renewing coolant is the best prevention of this. A professional flushing or replacement of radiator may be required to fix. 4. Head gasket or cracked head. This would be a major engine mechanical failure and would require removal of cylinder heads for close inspection. Other gasket failures could also contribute to overheating by allowing air into the cooling system, thereby lowering the boiling point.

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