Grand Caravan V6-3.3L VIN E Flex Fuel (2007)
Blower Motor: Description and Operation
Operation - Front
OPERATION
The front blower motor is used to control the velocity of air moving through the front HVAC housing by spinning the blower wheel within the housing at
the selected or programed speed (depending on application).
On models equipped with the manual temperature control (MTC) heating-A/C system, the front blower motor will operate whenever the ignition switch
is in the On position and the blower control switch is in any position except Off. On models equipped with the automatic temperature control (ATC)
heating-A/C system, the front blower motor will operate whenever the ignition switch is in the On position and the A/C-heater control power is turned
on.
The front blower motor relay output circuit is protected by a fuse in the integrated power module (IPM) located in the engine compartment. In the MTC
system, the front blower motor speed is controlled by regulating the path to ground through the blower control switch and the blower motor resistor. In
the ATC system, the front blower motor speed is controlled by an electronic blower motor power module, which uses a pulse width modulated input
from the A/C-heater control and a feedback signal from the blower motor to regulate the blower motor ground path. On both systems, the front blower
motor receives battery current whenever the front blower motor relay is energized.
The front blower motor and blower motor wheel are factory balanced and cannot be adjusted or repaired. If faulty or damaged, the front blower motor
and blower wheel must be replaced as an assembly.
