To keep an engine cool in hot weather, which action is recommended?

To keep an engine cool in hot weather, which action is recommended?

• A. Use thicker coolant
• B. Make sure the engine has the right amount of oil
• C. Remove the radiator cap
• D. Turn off the cooling system

Answer: (B)

Heat in an engine comes from combustion and from moving parts rubbing together. The oil isn’t just for lubrication; it also carries heat away from hot surfaces to the oil pan and cooler. When the oil level is right, there’s enough oil to form a protective film and absorb heat, helping the engine stay cooler, especially in hot weather. If the oil level is low, there isn’t enough oil to remove heat effectively, and temperatures can rise, increasing the risk of overheating. The other options don’t address this heat-transfer role or can cause harm: thicker coolant isn’t a reliable fix and can reduce heat transfer, removing the radiator cap is dangerous, and turning off the cooling system stops heat removal entirely.

Heat in an engine comes from combustion and from moving parts rubbing together. The oil isn’t just for lubrication; it also carries heat away from hot surfaces to the oil pan and cooler. When the oil level is right, there’s enough oil to form a protective film and absorb heat, helping the engine stay cooler, especially in hot weather. If the oil level is low, there isn’t enough oil to remove heat effectively, and temperatures can rise, increasing the risk of overheating. The other options don’t address this heat-transfer role or can cause harm: thicker coolant isn’t a reliable fix and can reduce heat transfer, removing the radiator cap is dangerous, and turning off the cooling system stops heat removal entirely.