福特鼓风机调速器 3M5H-18B647-AC 1325972 电阻模块原厂品质

For Ford vehicles where the HVAC blower only blows at the highest speed or has no airflow at low speeds and speed control is failing, the blower motor resistor (speed control) is aged or burnt. This part controls blower motor speed by adjusting resistance to achieve multiple fan speeds for stable airflow. OEM numbers 3M5H-18B647-AC / 1325972 / 3M5H-18B647-AD. Installation requires disconnecting the battery negative, ensure the module is firmly inserted into the blower housing slots with good heat sink contact to prevent reseating damage.