Blower Motor - Operation

OPERATION

The blower motor controls 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 Automatic Temperature Control (ATC) heating and A/C system uses an electronic blower motor power module to control blower motor speed. The power module uses a Pulse Width Modulated (PWM) input from the A/C heater control and a feedback signal from the blower motor to regulate the blower motor ground path. The blower motor receives battery current through the Totally Integrated Power Module (TIPM) whenever the ignition is in RUN, and the blower motor control is in any position except Off.

The blower motor control system is diagnosed using a scan tool .

The blower motor and blower motor wheel are factory balanced and cannot be adjusted or repaired and must be replaced as an assembly if inoperative or damaged.