RAM 2500 Truck 2WD L6-5.9L DSL Turbo VIN 6 (1998)
Blower Motor Resistor: Description and Operation
Blower Motor Resistor
The blower motor resistor is mounted to the bottom of the heater-A/C housing, under the instrument panel and just inboard of the blower motor. It
can be accessed without removing any other components.
The resistor has multiple resistor wires, each of which will change the resistance in the blower motor ground path to change the blower motor
speed. The blower motor switch directs the ground path through the correct resistor wire to obtain the selected blower motor speed.
With the blower motor switch in the lowest speed position, the ground path for the motor is applied through all of the resistor wires. Each higher
speed selected with the blower motor switch applies the blower motor ground path through fewer of the resistor wires, increasing the blower motor
speed. When the blower motor switch is in the highest speed position, the blower motor resistor is bypassed and the blower motor receives a direct
path to ground.
The blower motor resistor cannot be repaired and, if faulty or damaged, it must be replaced.
