Which condition can indicate a clogged radiator?

A clogged radiator can lead to engine overheating because the primary function of the radiator is to dissipate heat from the engine coolant. When the radiator is obstructed, it cannot effectively transfer heat away from the engine. This lack of proper heat dissipation can cause the engine temperature to rise to levels that may trigger overheating.

Overheating can lead to serious engine damage if not addressed, as it can cause components to warp or seize. Monitoring the engine temperature is crucial in identifying this condition, and if the temperature gauge indicates excessively high readings, it may be a sign that the radiator is clogged and not performing its cooling function appropriately. The other options do not directly relate to the function and consequences of a clogged radiator in the same way that engine overheating does.