Antifreeze, or engine coolant, is a colored liquid that is mixed with water to help regulate your engine during extreme temperatures.



What Is Antifreeze?

Antifreeze, or engine coolant, is a colored liquid that is mixed with water to help regulate your engine during extreme temperatures. As the temperature outside changes from hot to cold coolant is pumped throughout the engine block to maintain an even operating temperature. Antifreeze does more than just regulate temperature, however. Maintaining proper fluid levels also helps to prevent corrosion.


How Does Engine Coolant Work?

Engine coolant is mixed with water, usually at a 50/50 ratio, and poured into the proper reservoir in your engine. The chemical ethylene glycol is used as a base to create a liquid that is pumped through your car’s engine to regulate and maintain an optimal operating temperature during extreme hot or cold weather conditions.


 How Often Does My Car Need New Coolant?

Most fluids your vehicle needs should be drained and replaced at various intervals in order to be effective. The same goes for your coolant. At least twice a year you should check your coolant levels—before the summer heat and before the winter cold. Consult your vehicle’s owner's manual for more precise information on when to flush and replace the coolant in your vehicle.

What percentage of antifreeze should I use?

The most common ratios used are 70 percent water to 30 percent antifreeze for very warm parts of the country, but in colder areas a safer ratio – and the one most manufacturers recommend – is 50:50 antifreeze to water.


Typical Properties Unit  Test Method Typical Values

Recommended Dilution with Water





ASTM D-1122


 pH  Diltion(50%)


ASTM D-1287


Boiling Point(50%)


ASTM D-11200


Freezing Point


ASTM D-1177



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