Why coolant fan runs after you shut off motor?

The coolant fan may continue to run after you shut off the engine to help dissipate heat from the engine and prevent overheating. This is especially common in vehicles with high-performance engines or in hotter climates where residual heat can linger. The fan is usually controlled by a temperature sensor that detects when the engine temperature is still above a safe threshold, ensuring optimal cooling. This cooling process helps prolong engine life and maintain optimal performance.