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If you are referring to the blower motor resistor then it is inside mounted on the evaporator case.
I think the blower motor relay is internal to the blower motor resistor which is located under the passenger side dash.
i had a 03 Chevrolet Colorado, and the resitor was located under the glove compartment, where the motor blower is, the resistor is screwed to the side of the blower. hope this works for you. the resistor is usually located there.
behind glovebox.
There is only one blower motor resistor and it is located in the evaporator housing.
You either have a blown fuse, defective blower motor, defective blower motor switch, or a defective blower motor resistor pack.
The blower motor speed resistor is burned out.
The blower motor resister is located just to the left of the blower motor on the passengers side right below the blower motor return air tube.......
Most likely the Blower Motor Resistor.
If you have only high speed on the blower motor or you are missing one or more low speeds, chances are the blower motor speed resistor is burned out.
A malfunctioning blower motor resistor will cause the blower motor not to work. When the resistor is bad the blower motors will not turn on.
Replace shoes brake 2003 Chevy