Although water can be added to the radiator for this purpose, it’s preferable to add a mixture of coolant and water because plain water can boil before the proper coolant will boil, causing your engine to overheat [source: pontiac]. A car radiator cannot work if there isn’t enough coolant inside the system.Click to see full answer. Also know, what happens if you don’t add water to coolant?Water freezes at too high of a temperature so mixing it with coolant dramatically lowers that temperature. It you’re topping off your radiator or reservoir, adding a quart or half a gallon of antifreeze/coolant isn’t going to hurt anything.Subsequently, question is, do you have to mix coolant with water? Buying an antifreeze that requires you to mix it with water can be a little more involved. However, it gives you more flexibility when it comes to mixture. Generally speaking, a 50/50 mixture of water and antifreeze is a good place to start. Subsequently, one may also ask, can I add tap water to coolant? regular tap or well water is just fine. The additives in the coolant is what keeps your cooling system clean and corosion free. This is why it is important to use the proper kind for your vehicle.Does the color of coolant matter?The truth is, color is not a reliable predictor for what type of coolant you have. For example, OAT coolants are usually orange, yellow, red or purple. Then the older IAT coolant is green. Coolants that manufacturers sell can confuse matters even more, like Honda’s blue coolant.
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