During a pre-operational fluid check, you discover that the engine coolant level in the expansion tank is significantly below the cold fill line. What safety precaution should be taken before attempting to add coolant?

Question: During a pre-operational fluid check, you discover that the engine coolant level in the expansion tank is significantly below the cold fill line. What safety precaution should be taken before attempting to add coolant?

Answer options: ✅ Ensure the engine is completely cool and the pressure system has depressurized.

• Start the engine and let it warm up for a few minutes to circulate the coolant.
• Wear appropriate personal protective equipment (PPE) including a hard hat and safety glasses.
• Check the engine oil level simultaneously to identify any cross-contamination.

Correct answer: Ensure the engine is completely cool and the pressure system has depressurized.

Explanation: Adding coolant to a hot, pressurized cooling system can be extremely dangerous, as hot coolant or steam can forcefully escape, causing severe burns. It is imperative to ensure the engine is completely cool and the system depressurized before opening the cap. PPE is always important, but the primary safety precaution for coolant addition is related to temperature and pressure. Checking oil is a separate check.