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Blower Motor Resistor - Typical:

A blower motor resistor is used on vehicles equipped with the front manual temperature control (MTC) heating-A/C system. Vehicles equipped with the automatic temperature control (ATC) heating-A/C system use a blower motor power module, instead of the blower motor resistor.

The front blower motor resistor is mounted to the rear of the front HVAC housing, directly behind the glove box. The front blower motor resistor consists of a molded plastic mounting plate with an integral wire connector receptacle. Concealed behind the mounting plate are coiled resistor wires contained within a ceramic heat sink.

The front blower motor resistor is accessed for service by removing the glove box.

The front blower motor resistor is connected to the vehicle electrical system through a dedicated wire lead and connector of the front HVAC wire harness. The front blower motor resistor has multiple resistor wires, each of which will reduce the current flow through the front blower motor to change the blower motor speed.

The blower motor control in the manual temperature control system directs the ground path for the front blower motor through the correct resistor wire to obtain the selected speed. With the blower motor control in the lowest speed position, the ground path for the front blower motor is applied through all of the resistor wires. Each higher speed selected with the blower motor control applies the blower motor ground path through fewer of the resistor wires, increasing the blower motor speed.

The front blower motor resistor cannot be adjusted or repaired and, if faulty or damaged (such as a cracked ceramic heat sink), it must be replaced.