Which of these will cause a loss of coolant?

Which of these will cause a loss of coolant?

• A. Faulty radiator cap
• B. Loose belt
• C. Worn spark plug wires
• D. Low fuel level

Answer: (A)

Cooling systems rely on pressurized coolant to raise the boiling point and keep flow consistent. The radiator cap seals the system and releases excess coolant only when the pressure reaches a set value, sending it to the overflow. If the cap is faulty, it won’t seal properly or may vent coolant too early, allowing coolant to escape from the system and the overflow tank—causing a loss of coolant. The other items don’t provide a path for coolant to leave: a loose belt can affect the water pump’s ability to circulate coolant (leading to overheating rather than immediate loss), worn spark plug wires are unrelated to the cooling system, and a low fuel level has no impact on coolant containment.

Cooling systems rely on pressurized coolant to raise the boiling point and keep flow consistent. The radiator cap seals the system and releases excess coolant only when the pressure reaches a set value, sending it to the overflow. If the cap is faulty, it won’t seal properly or may vent coolant too early, allowing coolant to escape from the system and the overflow tank—causing a loss of coolant. The other items don’t provide a path for coolant to leave: a loose belt can affect the water pump’s ability to circulate coolant (leading to overheating rather than immediate loss), worn spark plug wires are unrelated to the cooling system, and a low fuel level has no impact on coolant containment.