If the engine cooling system fails, what is the most likely consequence?

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The cooling system keeps engine temperature within a safe range by circulating coolant to absorb heat from the engine and dissipate it in the radiator. If this system fails, heat isn’t removed effectively, so the engine overheats. Excessive heat causes the metal parts to expand unevenly, which can warp the cylinder head or engine block and blow or leak the head gasket. Oil viscosity can drop with high temperatures, leading to increased wear and possible bearing or piston damage. If the overheating continues, it can cause a catastrophic engine seizure. The other options don’t fit because cooling failure directly raises temperature rather than leaving it unchanged or increasing power; overheating is the primary and most likely consequence.