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Blower Motor Resistor

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What does a blower motor resistor do?

 

The blower motor resistor provides multiple resistance levels or speed settings for the blower motor. These settings typically include high, medium-high, medium, and low speeds. To achieve different fan speeds, the blower motor resistor restricts the voltage supplied to the blower motor. This is done by using a series of resistors or electrical pathways that reduce the electrical current flowing to the motor. When you adjust the fan speed on your HVAC control panel, it sends a signal to the blower motor resistor, which then adjusts the resistance and voltage supplied to the blower motor accordingly. This controls the fan speed and, subsequently, the volume of air entering the vehicle's cabin.

 

Signs of a bad blower motor resistor

 

If you observe any of the following signs, it may indicate a bad blower motor resistor in your vehicle:

  • Limited fan speed control: Inability to adjust fan speed, often stuck on high.
  • No airflow control: Limited or no control over the airflow through the vents.
  • Intermittent operation: Blower motor works unpredictably, starting and stopping randomly.
  • High-speed stuck: Fan continuously runs at high speed, even with lower settings selected.
  • Unusual noises: Blower motor may produce strange sounds like humming or buzzing.
  • Temperature control issues: Difficulty achieving or maintaining desired cabin temperature.
  • Electrical problems: Overheating or burnt smell in the cabin, indicating potential electrical issues.
  • Battery drainage: Blower motor continues running after the vehicle is off, potentially draining the battery.
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