Only one speed on the heater blower motor is the switch bad are the motor


Asked by Dec 16, 2015 at 10:54 AM about the 2004 Chevrolet TrailBlazer

Question type: Maintenance & Repair

2 Answers


The resistor would be the blower motor, follow the wires back from blower motor.

Mark Grignon

It is highly likely that the Fan speed resistor module has failed. This resistor pack limits the voltage to the motor in stages resulting in controlling the fan speed depending on the switch position. If all you have is one speed, I would suspect the fan speed (resistor) module.

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