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What Are the Symptoms of a Faulty Car Air Conditioner Blower Resistor?

1 Answers

VonGenevieve

07/30/25 3:36am

When a car blower resistor is faulty, the most obvious symptom is the inability to adjust the air conditioner's fan speed, as the primary function of the car blower resistor is to control the speed of the fan. Method to determine if the blower resistor is damaged: Prepare a multimeter, set it to the ohm range, place the red probe of the multimeter on the positive terminal of the resistor and the black probe on the negative terminal. Then check if the reading on the multimeter is normal. If the measured resistance value is 0, it indicates that the resistor is damaged. If the blower resistor is faulty, it needs to be replaced. The replacement steps are as follows: Prepare the necessary tools for replacement, such as a new blower resistor and a Phillips screwdriver, then turn off all the vehicle's electrical equipment and the ignition switch; disconnect the vehicle's battery and the blower assembly connector (the blower is usually located under the glove compartment in front of the passenger seat), remove the blower's fixed wiring harness, then unscrew the blower assembly's mounting screws; You can find the resistor at the location where the blower was removed (connected near the air duct), use tools to remove it, and install the new resistor; Reinstall the blower and all the wiring, then reconnect the battery, start the car and turn on the blower to check if the fan speed can be adjusted.

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