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How to Replace the C4L Fan Resistor?

2 Answers

DeOmar

09/04/25 2:45am

After the fan resistor fails, the speed of the fan will decrease. In such cases, it is necessary to visit a professional repair shop or a 4S store for replacement. Below is relevant information: 1. Cause of Failure: To check the working condition of the blower, first inspect whether the fan produces abnormal noises during operation. Try adjusting the speed control switch from low to high gear. If the airflow changes, it indicates the fan is working normally. If there is no change in airflow, it may be due to a damaged speed controller or resistor, which needs to be replaced promptly. 2. Car Fan Resistor: The resistor in the car fan is mainly used to control the wind speed. If the resistor fails, the symptoms are similar to those of a faulty speed controller. In this state, the fan cannot adjust its speed and can only operate at either the maximum or minimum speed.

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VanFaith

09/16/25 3:57am

I just replaced the fan resistor for my friend's C4L. The first step was to disconnect the negative terminal of the battery and wait for 10 minutes to ensure the system was completely powered off. After opening the engine hood, the fan resistor was hidden behind the radiator frame, requiring the removal of the intake hose for clear access. Using a T20 screwdriver, I removed the mounting screws, and when unplugging the connector, I pressed the clip and gently wiggled it out. Before installing the new resistor, I applied some conductive silicone grease to the connector contacts to prevent oxidation, and made sure not to overtighten the screws to avoid cracking the plastic bracket. After installation, I tested the fan speed settings—if the first and second speeds returned to normal, it meant the job was done. Doing it myself saved about three to four hundred in labor costs, though spending half an hour hunched over the engine bay was a bit tough on the back.

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