Blower Controls System Check

Check fuses, fusible links and circuit breakers. Replace as necessary. Ensure harness connectors are tight and free of corrosion. Ensure ground connections are clean and tight. Operate system through all functions to verify problems. Turn ignition on. Move front or auxiliary blower speed selector switch from low to high positions and listen for increase in blower motor speed at each switch position. Move blower speed selector switch from high to low positions and listen for decrease in blower motor speed. If blower motor is inoperative in any or all speeds, go to appropriate blower motor diagnostic procedure.