Why do my coolant fan continue to run?

Your coolant fan may continue to run for several reasons, including the engine temperature being above the normal operating range, a malfunctioning temperature sensor, or a faulty fan relay. It can also be a normal function if the vehicle is in stop-and-go traffic or has just been turned off after a drive, as the fan may run to cool down the engine. If the fan runs excessively or when the engine is off, it could indicate a problem that requires further diagnosis.