When a coolant is part of a pressurized system, which statement is true?

When a coolant is part of a pressurized system, which statement is true?

• A. You can check the coolant level of a hot engine
• B. You must never check coolant level when the engine is hot
• C. You must remove the radiator cap before checking
• D. You should check only when the engine is cold

Answer: (A)

When a cooling system is pressurized, you must not open or check the coolant level while the engine is hot. The pressure inside the system can force hot coolant and steam out, leading to severe burns. The safe practice is to wait until the engine has cooled before checking. In most cars you’ll check the level in the overflow reservoir when it’s cold and top it up to the recommended mark if needed. This helps ensure you’re reading an accurate level and avoids dangerous splashes.

When a cooling system is pressurized, you must not open or check the coolant level while the engine is hot. The pressure inside the system can force hot coolant and steam out, leading to severe burns. The safe practice is to wait until the engine has cooled before checking. In most cars you’ll check the level in the overflow reservoir when it’s cold and top it up to the recommended mark if needed. This helps ensure you’re reading an accurate level and avoids dangerous splashes.