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The operating temperature of an engine is very close to the boiling point of water. Hotspots within the cooling system can lead to localised boiling, generating steam which increases system pressure and prevents effective cooling.
Evans Waterless Coolants have a boiling point of over 180°C, far above the operating temperature of the engine. The high boiling point ensures that the coolant remains liquid at all times enabling consistently effective cooling. Eliminating water elimates the problem of engine overheating, boil-over and after-boil.