Commander 4WD V8-4.7L VIN N (2006)
Blower Motor Resistor: Description and Operation
Rear
RESISTOR-BLOWER MOTOR
DESCRIPTION
A rear blower motor resistor is used on this model when it is equipped with the rear heater-A/C system. The rear blower motor resistor is mounted to the
back of the rear HVAC housing, directly below the rear blower motor. The rear blower motor resistor consists of a molded plastic mounting plate (1)
with an integral wire connector receptacle (2). Concealed behind the mounting plate are coiled resistor wires contained within a ceramic heat sink (3).
The rear blower motor resistor is accessed for service by removing the rear HVAC housing from the right side of the vehicle.
OPERATION
The blower motor resistor for the rear heating-A/C system is connected to the vehicle electrical system through a dedicated wire lead and connector of
the rear HVAC wire harness. The rear blower motor resistor has multiple resistor wires, each of which will reduce the current flow through the blower
motor to change the blower motor speed.
The blower motor switch in the rear heater-A/C system directs the ground path for the rear blower motor through the correct resistor wire to obtain the
selected speed. With the rear blower motor control in the lowest speed position, the ground path for the rear blower motor is applied through all of the
resistor wires. Each higher speed selected with the rear blower motor control applies the blower motor ground path through fewer of the resistor wires,
increasing the rear blower motor speed.
The rear blower motor resistor cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.
