Blower Motor: Description and Operation

The blower motor (1) is used to control the velocity of air moving through the HVAC housing by spinning the blower wheel (3) within the HVAC air inlet housing at the selected speed.

The blower motor is a 12-volt, direct current (DC) motor mounted within a plastic housing with an integral wire harness connector (2) and squirrel cage-type blower wheel (3) that is secured to the blower motor shaft (4). The blower wheel is positioned within the air inlet housing on the passenger side end of the HVAC housing.

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 resistor block, 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 wheel are factory balanced and cannot be adjusted or repaired. If faulty or damaged, the blower motor and wheel must be replaced as an assembly.