The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the鼓风机电机。由于风扇速度是空调系统最常调整的设置之一，因此鼓风机电阻器处于恒定的压力下，这会导致其变为最终失败。失败的鼓风机电动机可能会导致整个加热和空调系统的操作问题。通常是bad or failing blower motor resistor会产生一些症状，以提醒驾驶员潜在问题。

1. Blower motor stuck on one speed

鼓风机电机电阻器故障的常见症状是粘在一种设置上的鼓风机。鼓风机电阻器是直接负责控制鼓风机电机风扇速度的组件。如果电阻短裤或失败，则可能导致鼓风机保持在一个风扇速度上。加热和空调系统仍可能以一种速度运行，但是必须更换电阻以恢复全功能。

2. Blower motor does not work on certain settings

Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. If the blower motor resistors’ internal components fail it may cause the blower motor to malfunction, or not function at all on one or more of the settings. This can also be caused by a blower motor switch, so a proper diagnosis is highly recommended if you are uncertain of what the issue may be.

3. No air from the vehicle’s vents

鼓风机电阻器故障的另一个症状是车辆通风口没有空气at all. Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor. A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will be left with no air coming from the vents.

As the blower motor resistor is the component directly responsible for powering the blower motor, when it fails it major issues with the blower motor and the heating and air conditioning system can be experienced. If your vehicle is displaying any of the symptoms above, or you suspect that your blower motor resistor may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, todetermine if the component should be replaced。