Rear

Rear Blower Motor:

The blower motor for the rear heating-A/C system is a 12-volt, direct current (DC) motor with an integral wire harness and connector that is mounted within a plastic housing with a squirrel cage-type blower wheel, which is secured to the blower motor shaft. The blower motor and wheel is located on the outboard side of the rear HVAC housing.

The blower motor can be accessed for service by removing the rear HVAC housing.

The rear blower motor is used to control the velocity of air moving through the rear HVAC housing by spinning the blower wheel within the housing at the selected or programed speed (depending on application).

On models equipped with the manual temperature control (MTC) heating-A/C system, the rear blower motor will operate only whenever the ignition switch is in the On position, the front blower control switch is in any position except Off and the rear blower control switch on the front A/C-heater control is in any position except Off. On models equipped with the automatic temperature control (ATC) heating-A/C system, the blower motor will operate whenever the ignition switch is in the On position, the A/C-heater control power is turned on and the rear blower control switch on the front A/C-heater control is in any position except Off. The rear blower motor can only be turned off by turning off the rear system at the front A/C-heater control.

The rear blower motor relay output circuit is protected by a fuse in the integrated power module (IPM) located in the engine compartment. In the MTC system, the rear 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 rear blower motor speed is controlled by an electronic blower motor power module, which uses a pulse width modulated input from the A/C-heater control and a feedback signal from the rear blower motor to regulate the blower motor ground path. The rear blower motor receives battery current whenever the rear blower motor relay is energized.

For diagnosis and testing of the rear blower motor, refer to testing.

The rear blower motor and blower motor wheel are factory balanced and cannot be adjusted or repaired. If faulty or damaged, the rear blower motor and blower wheel must be replaced as an assembly.