Operation - Front

Blower Motor:

The blower motor is a 12-volt, Direct Current (DC) motor with a squirrel cage-type blower wheel that is secured to the blower motor shaft. The blower motor and wheel are located near the passenger side end of the HVAC housing in the passenger compartment below the instrument panel. The blower motor and blower motor wheel are factory balanced and cannot be adjusted or repaired. If faulty or damaged, the blower motor and blower wheel must be replaced as an assembly.

On models equipped with the manual heater-A/C system, the blower motor will operate whenever the ignition switch is in the On position and the blower control switch is in any position except Off. On models equipped with the Automatic Temperature Control (ATC) system, the blower motor will operate whenever the ignition switch is in the On position and the A/C-heater control power is turned on.

The blower motor receives battery current whenever the front blower motor relay is energized. The front blower motor relay output circuit is protected by a fuse in the Integrated Power Module (IPM) located in the engine compartment near the battery. In the manual heater-A/C system, the blower motor speed is controlled by regulating the path to ground through the blower control switch and the blower motor resistor. In the ATC system, the blower motor speed is controlled by an electronic blower motor power module, which uses a pulse width modulated input from the ATC module and feedback from the blower motor to regulate the blower motor ground path it provides. The blower motor and wheel are used to control the velocity of air moving through the HVAC housing by spinning the blower wheel within the housing at the selected speed or, in the ATC system, at the selected or programmed speed.