Magnum SRT-8 V8-6.1L VIN 3 (2006)
Blower Motor: Description and Operation
MOTOR-BLOWER
DESCRIPTION
The blower motor (1) 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 motor wheel is located in the HVAC air inlet housing which is
mounted to the passenger side end of the HVAC housing. The blower motor can be accessed for service from underneath the instrument panel.
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 or, in the ATC system, at the selected or programmed speed.
On models equipped with the manual temperature control (MTC) heating-A/C system, the blower motor will operate whenever the ignition switch is in
the On position and the blower motor control in any position except Off. On models equipped with the automatic temperature control (ATC) system, the
blower motor will operate whenever the ignition switch is in the On position and the A/C-heater control power is turned on.
For the MTC system, blower motor speed is controlled by directing the ground path for the blower motor through the correct resistor wire to obtain the
selected speed.
For the ATC system, blower motor speed is controlled by the blower motor power module which provides the blower motor with power and a path to
ground. The blower motor power module also sends a blower control signal to the A/C-heater control. Using input from the blower motor control
(manual mode ) or sensor data (automatic mode), the A/C-heater control processes the blower control signal from the power module and sets the speed at
which the blower motor will run.
The blower motor and blower wheel are factory balanced and cannot be adjusted or repaired. If faulty or damaged, the blower motor and blower wheel
must be replaced as an assembly.
