First, check all fuses under the instrument panel and under the hood in the Power Distribution Center. Power to the blower motor is via the ignition switch, through the A/C heater control and the resistor block to ground. The resistor block is a place to start as it is easy to replace and the part is not expensive. The blower motor may also be defective. This is easily checked by disconnecting the blower motor wiring connector and applying 12volts to the motor lead and grounding the remaining wire. Positive to the Green Wire.