What is the reason for the Jetta fan not rotating at low speed?

[VanIsabel]

Jetta fan not rotating at low speed is due to poor water temperature control, insufficient transformer current, or fan malfunction. The following are specific reasons: Water temperature issue: Poor water temperature control can cause the cooling fan not to rotate. Generally, at lower temperatures, its water temperature sensor cannot influence the generator to start the fan, thus affecting the rotation of the car's cooling fan. Therefore, it is necessary to properly control the water temperature to meet the specified requirements. Insufficient transformer current: The adjustment of fan speed relies on the transformer. So, when the current inside the transformer is too small or there is an internal malfunction, it will affect the operation of the cooling fan. Therefore, it is necessary to check whether the current flowing through the transformer is within the normal range and whether this part is functioning properly. Fan malfunction: The reason for the car cooling fan not rotating is also related to the fan itself. It must be strictly inspected and repaired or replaced in time to avoid affecting the use of the car.