BOILING POINT ELEVATION Red Line WaterWetter® does not significantly increase the boiling point of water; however, increasing pressure will raise the boiling point. The boiling point of water treated with Red Line using a 15 psi cap is 250°F compared to 265°F at 15 psi for 50% glycol. Increasing the pressure by 50% to 23 psi will increase the boiling point of water to 265°F. Because of the doubling of the ability of the radiator to transfer heat, boilover using Red Line treated water is not a problem as long as the engine is circulating coolant through the head and the fan is circulating air. Sudden shutdown after very hard driving may cause boilover.
FREEZING POINT DEPRESSION Red Line WaterWetter® does not significantly reduce the freezing point of water. If the vehicle will see freezing temperatures, an antifreeze must be used. Water expands approximately 9% upon freezing which can cause severe engine damage. Even in summertime, the use of air-conditioning can blow freezing air through the heater and cause freezing of the heater core unless approximately 20% antifreeze is used.