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Automotive engines generate heat through the combustion of fuel.
About 30 percent of that heat must be dissipated through a cooling system, including a fluid coolant, to prevent engine failure through excessive heat buildup. The fluid that provides much of the cooling function must not freeze, expand and crack the engine block in cold temperatures, so the fluid must provide coolant and antifreeze activity. Glycols are organic compounds. They are clear, colorless, nearly odorless liquids. They are heavier and more viscous than water at all temperatures and have much higher boiling points than water does.