日产散热之选：冷却风扇电阻模块21493-B210B / 135A124，即刻回归清凉

Nissan cooling fan resistor module (OEM numbers 21493-B210B/135A124) installs directly on the cooling fan assembly; its core function is to intelligently regulate fan speed according to engine conditions to achieve optimum cooling. Compatible with 21493-4GA0A, 21493-B210B, 135A124 and other OEM numbers across Nissan models. Installation requires disconnecting the battery negative and careful wiring. Estimated labor: 0.5-1 hour. If A/C cooling diminishes, engine overheats, or the fan runs only at high speed, the resistor module may be faulty and should be replaced.