What should an operator do if the engine starts to overheat?

If the engine starts to overheat, the appropriate action is to stop operation, allow the engine to cool, and check coolant levels. This approach is crucial because continuing to operate an overheating engine can lead to severe damage, such as warped components or engine failure. Allowing the engine to cool down allows for a proper assessment of the situation. Checking the coolant levels ensures that there is sufficient fluid to regulate the engine's temperature.

The other choices present actions that could exacerbate the overheating problem or lead to unnecessary risks. Ignoring the overheating could lead to catastrophic damage. Increasing power to an already overheating engine is counterproductive and likely to worsen the situation. Contacting maintenance while still operating does not address the immediate need to stop and cool the engine, which is essential to prevent further damage or safety hazards.