Which process should be followed to diagnose an overheating engine?

To diagnose an overheating engine, checking the coolant level, inspecting for leaks, and assessing the thermostat is the most appropriate process.

When an engine overheats, it is critical to determine the cause, which often involves verifying that the cooling system is functioning properly. The coolant is essential because it absorbs heat from the engine and prevents it from reaching dangerous temperatures. A low coolant level can indicate a leak or an issue with the cooling system, so this should be one of the first things to check.

Inspecting for leaks is crucial because a leak can lead to a loss of coolant, resulting in inadequate cooling. Look for any visible signs of coolant on the ground or in the engine compartment.

The thermostat plays a vital role in regulating coolant flow; if it is stuck closed, the flow of coolant will be impeded, causing overheating. Therefore, assessing its operation can help pinpoint a significant source of the problem.

Addressing the other choices is less relevant in the context of diagnosing overheating. Changing the oil immediately may be necessary for engine health but does not directly relate to addressing an overheating issue. Replacing the fuel filter focuses on fuel delivery rather than cooling, and adjusting the timing belt is unrelated to engine temperature regulation. Thus, the recommended approach is to