What methods are used to diagnose an overheating engine?

Diagnosing an overheating engine primarily involves examining the cooling system and its components because a properly functioning cooling system is essential for regulating engine temperature. Checking coolant levels is a crucial step; low coolant can lead to insufficient cooling, causing the engine to overheat. Testing the radiator is also vital, as a malfunctioning radiator can prevent adequate heat dissipation, which contributes to overheating.

The other methods, while important for overall vehicle maintenance, do not directly address issues related to engine overheating. Replacing the battery and alternator pertains to electrical system issues, inspecting tire pressure and alignment relates to tire and suspension components, and evaluating transmission fluid levels concerns the transmission system. None of these methods will effectively diagnose or resolve problems leading to an overheating engine. Therefore, option B is the appropriate choice for understanding and diagnosing overheating issues.