What does the coolant temperature light warn the driver about?

The coolant temperature light serves a critical function in a vehicle's diagnostic system by alerting the driver to potential overheating of the engine. When this warning light illuminates, it indicates that the engine coolant temperature is higher than the normal operating range. This can occur due to various reasons, such as a low coolant level, a malfunctioning thermostat, a blocked radiator, or issues with the water pump.

Ignoring this warning can lead to serious engine damage, as prolonged overheating can result in warped cylinder heads, blown gaskets, or even complete engine failure. Therefore, if the coolant temperature light comes on, it is essential for the driver to take immediate action, such as pulling over to allow the engine to cool down and checking coolant levels.

The other options, while they are symptoms of different vehicle issues, do not relate specifically to the function of the coolant temperature light. Recognizing the significance of this warning is crucial for maintaining vehicle health and ensuring safe driving conditions.