Does the motor not work at all or only on high setting? if only on high setting, i would recommend replacing the blower motor resistor. if it does not work at all, i would check the blower motor fuse first, if that has power, i would unplug the blower motor, key in run, and turn the fan on, then check for power at the blower motor connector, then check for ground, if both present, then replace the blower motor.
SOURCE: 2005 silverado 1500, blower motor working
try this unplug the wireing from the resistor and look at the plug take special notice of the third pin from the left and I think you will see that is melted, it seems to be a common problem. the fix is to replace the resistor and the plug. Most auto parts stores will carry them I got mine at advance auto. I hope this helps you.
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