- The primary electric radiator fan is controlled by the engine computer (PCM) and is typically activated when the coolant temperature reaches a predetermined threshold, usually around 220-230 degrees Fahrenheit (104-110 degrees Celsius).
- The secondary fan is mechanically driven by the engine's serpentine belt and operates at a constant speed regardless of engine temperature.
It's normal for the primary electric cooling fan to cycle on and off as needed to maintain the desired coolant temperature. However, if both fans are running continuously, it could indicate a problem with the cooling system, such as a faulty temperature sensor, thermostat, or cooling fan relay. It is recommended to have the cooling system inspected by a qualified mechanic to diagnose and resolve the issue.
