Can You Add Water When Coolant Is Low?

[AshleyDella]

You should not add water when coolant is low. Here are the reasons: 1. Coolant, fully known as antifreeze coolant, serves both antifreeze and cooling functions as its name suggests. Water should not be added to the radiator unless in an emergency, as water has a low boiling point and is prone to boiling over, resulting in poor cooling performance. 2. Water has a high freezing point, making it prone to freezing, which can affect engine or radiator operation. 3. Water contains impurities and ions, which can form scale and cause blockages. 4. Coolant provides antifreeze, cooling, anticorrosion, and antiscaling functions. Although coolant also contains water, it is soft water—specifically, distilled water that has undergone deionization and softening treatment.