Is It Serious If the Car Fan Keeps Running?

[MorganMarie]

If the car fan keeps running, it generally indicates two potential issues: first, the water temperature in the radiator is too high, and second, the fan may be damaged. Below are detailed explanations: High Water Temperature: The engine operates optimally within a certain temperature range. Once the car is started, the engine generates heat. Especially during low-speed driving or traffic jams, the water temperature rises rapidly. The engine's water temperature is monitored, and when it gets too high, the fan is activated. However, the temperature should not keep rising indefinitely. If persistent high temperatures occur, it's advisable to first check whether the cooling components are functioning properly. Prolonged Fan Operation: Most economy vehicles are equipped with one large fan, while slightly better models have two fans: the radiator cooling fan and the air conditioning cooling fan, both of which help accelerate heat dissipation. If the fan runs for an extended period, it's important to inspect the following two aspects: the fan control unit and the thermostat, as well as the vehicle's ECU (Engine Control Unit).