Cause of abnormal startup of engine fan

The engine fan is automatically controlled by a temperature sensor mounted near the thermostat

When the engine temperature reaches a certain point, the engine fan starts automatically (the opening temperature varies according to different models).

After the vehicle starts, the temperature of the engine fan will rise rapidly to more than 80 degrees under the control of the thermostat. When the temperature exceeds the thermostat, the cooling water will be automatically transferred to the major circulation for heat dissipation. When the temperature continues to rise, the cooling fan will operate automatically.

Generally speaking, the wind coming from the car is enough to dissipate the heat, and if you are not driving at a high speed, the fan will operate automatically, which is normal.