Can I add water if the car engine coolant is insufficient?

[VonLyla]

You cannot add water if the car engine coolant is insufficient. In emergency situations, adding a small amount of water is acceptable, but water should only fully replace coolant under extreme circumstances. Even when forced to add water, it is advisable to use distilled water to avoid affecting the thermostat and cooling system. Coolant, also known as antifreeze coolant, is designed to prevent freezing during cold seasons, protecting the radiator and engine cylinder block from damage due to expansion. Antifreeze is not just for winter use; it should be used year-round. As part of regular car maintenance, the engine coolant should be replaced annually.