MOTOR-BLOWER
DESCRIPTION
The blower motor (1) is a 12-volt, direct current (DC) motor mounted within a plastic housing with an integral wire lead and connector (2) and squirrel cage-type blower wheel (3) that is secured to the blower motor shaft (4). The blower motor wheel is located in the HVAC air inlet housing which is mounted to the passenger side end of the HVAC housing.
The blower motor can be accessed for service from underneath the instrument panel.
OPERATION
The blower motor is used to control the velocity of air moving through the HVAC housing by spinning the blower wheel within the HVAC air inlet housing at the selected speed or, in the ATC system, at the selected or programmed speed.
On models equipped with the manual temperature control (MTC) heating-A/C system, the blower motor will operate whenever the ignition switch is in the On position and the blower motor control 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.
For the MTC system, blower motor speed is controlled by directing the ground path for the blower motor through the correct resistor wire to obtain the selected speed.
For the ATC system, blower motor speed is controlled by the blower motor power module which provides the blower motor with power and a path to ground. The blower motor power module also sends a blower control signal to the A/C-heater control. Using input from the blower motor control (manual mode) or sensor data (automatic mode), the A/C-heater control processes the blower control signal from the power module and sets the speed at which the blower motor will run.
The blower motor and blower wheel are factory balanced and cannot be adjusted or repaired and must be replaced as an assembly if found inoperative or damaged.
REMOVAL
WARNING: Disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the negative battery (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to take the proper precautions could result in accidental airbag deployment and possible personal injury or death.
NOTE: LHD model shown. RHD model similar.
1. Disconnect and isolate the negative battery cable.
2. Remove the instrument panel silencer from the passenger side of the instrument panel (refer to 23 - BODY/INSTRUMENT PANEL/INSTRUMENT PANEL SILENCER - REMOVAL)
3. Remove the glove box from the instrument panel (refer to 23 - BODY/INSTRUMENT PANEL/GLOVE BOX - REMOVAL).
4. Disconnect the blower motor wire harness connector (1) from the blower motor power module or resistor (2), depending on how equipped.
5. Remove the three screws (3) that secure the blower motor (4) to the HVAC housing (5).
6. Remove the blower motor from the HVAC housing.
INSTALLATION
NOTE: LHD model shown. RHD model similar.
1. Position the blower motor (4) into the HVAC housing (5).
2. Install the three screws (3) that secure the blower motor to the HVAC housing. Tighten the screws to 2.2 N·m (20 in. lbs.).
3. Connect the wire harness connector (1) to the blower motor power module or resistor (2), depending on how equipped.
4. Install the glove box into the instrument panel (refer to 23 - BODY/INSTRUMENT PANEL/GLOVE BOX - INSTALLATION).
5. Install the instrument panel silencer onto the passenger side of the instrument panel (refer to 23 - BODY/INSTRUMENT PANEL/INSTRUMENT PANEL SILENCER - INSTALLATION)
6. Reconnect the negative battery cable.