Engine coolant is made up of what?

Engine coolant is made up of what?

• A. Water and antifreeze
• B. Water
• C. Oil and water
• D. Antifreeze only

Answer: (A)

Coolant is a blend that both carries heat away from the engine and protects the cooling system. The best answer is a mixture of water and antifreeze. Water conducts heat well, which helps remove heat from the engine, but it can freeze in cold weather and boil at high temperatures, risking engine damage. Antifreeze lowers the freezing point and raises the boiling point, so the coolant stays liquid in cold weather and doesn’t boil over in hot conditions. It also has additives to protect metal parts from corrosion and to lubricate the water pump. Using only water would leave you vulnerable to freezing, boiling, and corrosion; using antifreeze alone wouldn’t provide as effective heat transfer. Oil and water don’t mix, so that combo wouldn’t provide proper cooling either. In many vehicles, a roughly 50/50 mix is used, but the exact ratio depends on climate and the vehicle, so follow the manual.

Coolant is a blend that both carries heat away from the engine and protects the cooling system. The best answer is a mixture of water and antifreeze. Water conducts heat well, which helps remove heat from the engine, but it can freeze in cold weather and boil at high temperatures, risking engine damage. Antifreeze lowers the freezing point and raises the boiling point, so the coolant stays liquid in cold weather and doesn’t boil over in hot conditions. It also has additives to protect metal parts from corrosion and to lubricate the water pump. Using only water would leave you vulnerable to freezing, boiling, and corrosion; using antifreeze alone wouldn’t provide as effective heat transfer. Oil and water don’t mix, so that combo wouldn’t provide proper cooling either. In many vehicles, a roughly 50/50 mix is used, but the exact ratio depends on climate and the vehicle, so follow the manual.