Can I Add Water When the Coolant Is Low?

[SanAngela]

When the coolant is low, you can add an appropriate amount of soft water, commonly known as distilled water, which has undergone deionization and softening treatment. However, the amount added should not be excessive, as it may alter the boiling and freezing points of the coolant. It is important to note that tap water or other hard water should never be added when the coolant is low. Adding such water can lower the boiling point and raise the freezing point of the coolant, making it prone to freezing in cold climates and reducing its effectiveness. When purchasing coolant, always choose the same brand and model as the original one used in the vehicle. If a different brand or model is used, the original coolant must be completely drained before adding the new one. Different brands and models of coolants may have varying formulations, and mixing them could lead to chemical reactions that impair the coolant's performance.