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Engine coolant is a chemical compound. It consists mainly of water, but water freezes too easily so an antifreeze is added. This helps prevent the coolant from freezing on winter days and it also raises the boiling point which is helpful. An antifreeze contains mainly ethylene, but also has some methanol and propylene. The water and antifreeze make up around 90% of the coolant. The rest of it is chemicals to prevent rust and corrosion (redox reactions) occurring. In other words... Coolant contains: Water - 60% Antifreeze - 30% Others - 10%

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