RAM 3500 Truck 4WD V8-5.7L VIN D (2003)
Blower Motor Resistor: Description and Operation
Blower Motor Resistor Block
BLOWER MOTOR RESISTOR BLOCK
The blower motor resistor is mounted to the bottom side of the HVAC housing on the passenger side of the vehicle.
The resistor is a ceramic resistor that utilizes resistor circuit tracers to reduce current flow to the blower. The blower motor switch directs the
ground path through the correct resistor circuit to obtain the selected 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 receives a direct path to ground.
The blower motor resistor cannot be repaired and, if faulty or damaged, it must be replaced.
