Can I add tap water if the car radiator runs out of water?

[EmilioRose]

You cannot add tap water to a car radiator that has run out of water. Here’s an introduction to car radiator antifreeze: Antifreeze boiling point: 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. It also has a high freezing point, making it susceptible to freezing, which can affect the engine or radiator and disrupt vehicle operation. Additionally, water contains impurities and ions that can form scale and cause blockages. If the engine coolant is insufficient, you can add soft water, but be cautious about the amount added. Adding too much can alter the coolant’s boiling and freezing points. However, hard water like tap water should not be added, as it can have negative effects. Main components of radiator antifreeze: Various additives and soft water (distilled water). If antifreeze is low, a small amount of distilled water can be added. However, ordinary tap water must not be used, as it dilutes the antifreeze concentration, raises the freezing point, and increases the risk of freezing in colder climates.