RAM 2500 Truck 2WD L6-5.9L DSL Turbo (2008)
Blower Motor: Description and Operation
Operation
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.
The blower motor will operate whenever the ignition switch is in the Run position and the blower motor control is in any position except Off. The blower
motor receives battery current through the totally integrated power module (TIPM) whenever the ignition switch is in the Run position.
Blower motor speed is controlled by regulating the ground path through or around the blower motor resistor and through the blower motor control
located within the A/C-heater control.
The blower motor can be accessed for service from underneath the instrument panel.
NOTE: The blower motor is supplied with a 12V feed from the TIPM, through the blower motor resistor, whenever the ignition switch is in the
RUN position. Due to an open circuit condition within the blower motor control switch the TIPM is UNABLE to detect an OPEN circuit for the
blower motor.
The blower motor control system is diagnosed using a scan tool.
The blower motor and blower motor wheel are factory balanced as an assembly and cannot be adjusted or repaired and must be replaced if found
inoperative or damaged.
