冷却风扇电阻器的目的是从发动机的冷却液和A/C制冷剂中去除热量。电阻通过通过散热器和空调冷凝器吸引空气来做到这一点。将皮带驱动风扇安装在温度控制的离合器上，冷却风扇电阻器一旦温度注册为太热，就会通过空气吸收空气。

当冷却风扇亮起时，电阻器会控制，并且通常会分阶段打开。当您打开车辆时，发动机加热得非常快，因此冷却风扇电阻器分阶段启动。这有助于均匀冷却发动机，并让您的车辆平稳运行。

After the engine reaches a hot temperature, which has already been determined by the manufacturer, a switch indicates the cooling fan resistor to start working at a high speed to draw more air through the radiator. This provides extra cooling to the engine so it does not overheat. Depending on the make and model of your vehicle, you may have a second fan which allows for more airflow for the cooling and air conditioning system. The second fan is powered by the cooling fan resistor as well, and always runs at a high speed.

Over time, one or both of your cooling fan resistors may become worn or fail due to everyday usage. If you suspect yourcooling fan resistor needs to be replaced，联系专业机械师。如果更换冷却风扇，则可能还需要更换电阻。

由于此部分可能会随着时间的流逝而失败，因此必须识别可能需要更换其症状。

标志需要更换冷却风扇电阻器包括：

• 冷却风扇根本无法开始工作
• 发动机温度上升到危险的程度
• The cooling fan never turns off, even if your vehicle is off
• Your vehicle is overheating on a regular basis

冷却风扇电阻是您的冷却系统的重要组成部分，因此，让它运行太长会导致发动机损坏过热和大量维修。