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What would cause your blower motor to work on only one speed a 97 Chevy k1500?

* Blower motor resistor: The blower motor resistor is responsible for controlling the speed of the blower motor. If the resistor is faulty, it may only allow the blower motor to work on one speed.

* Wiring: The wiring between the blower motor and the resistor, or between the resistor and the switch, may be damaged or loose. This can prevent the blower motor from receiving the correct voltage to operate on different speeds.

* Blower motor switch: The blower motor switch is responsible for turning the blower motor on and off and selecting the different speeds. If the switch is faulty, it may only allow the blower motor to work on one speed.

* Blower motor: It is also possible that the blower motor itself is faulty and only able to operate on one speed.

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