What should be avoided when dealing with an overheated engine?

The correct choice is related to the necessity of caution when adding coolant to an overheated engine. It is important to avoid adding coolant without checking because doing so can exacerbate the problem. When an engine is overheated, the coolant in the system is often at a boiling point, and opening the radiator cap or coolant reservoir can lead to a sudden release of steam and hot fluids that may cause burns or injury.

Furthermore, simply adding coolant can also mask underlying issues, such as leaks or blockages within the cooling system. It's essential to take proper steps, such as allowing the engine to cool down before checking the levels, to ensure that the problem is diagnosed correctly and safely.

While turning off the engine immediately might seem counterintuitive, it is often a necessary step in preventing further damage. Parking the vehicle safely is critical to avoid hazards, and checking the radiator is a logical step in assessing the situation. However, immediately adding coolant without evaluating the condition could lead to accidents or additional damage to the vehicle's cooling system.