Car Radiator Coolant

Car coolant, also known as antifreeze coolant, protects engines from overheating. Coolant also lubricates the moving parts it comes into contact with, which protects against damage to the water pump, head gasket, cylinder and piston timing. This is a frequently asked question, yes you can top up with just water, but you should only do this in an emergency to enable you to get to a garage. Engine coolant contains antifreeze, so diluting with water will lower the boiling point and the coolant will stop working efficiently.