Grand Caravan V6-3.8L VIN L (2007)
Air Door Actuator / Motor: Description and Operation
Blend Door Actuator
Description - Front
DESCRIPTION
The blend door actuators for the front heating-A/C system are reversible, 12-volt Direct Current (DC), servo motors (Figure 1). Models with the front
single zone heating-A/C system have a single blend-air door, which is controlled by a single blend door actuator. Models with the optional front dual
zone heating-A/C system have dual blend-air doors, which are controlled by two blend door actuators.
The blend door actuator for the single zone heating-A/C system is located on the driver side end of the front HVAC air distribution housing, close to the
middle of the distribution housing.
For the dual zone heating-A/C system, the same blend door actuator used for the single zone system becomes the driver side blend door actuator, which
is mechanically connected to only the driver side blend-air door. A second separate blend door actuator is also located on the driver side of the front
HVAC air distribution housing which is mechanically connected to only the passenger side blend-air door.
The front blend door actuators are interchangeable with each other, as well as with the actuators for the mode-air door and the recirculation-air door.
Each actuator is contained within an identical black molded plastic housing with an integral wire connector receptacle. Each actuator also has an
identical output shaft with splines that connect it to its respective door linkage and two integral mounting tabs that allow the actuator to be secured to the
front HVAC housing. The front blend door actuators do not require mechanical indexing to the blend-air doors, as they are electronically calibrated by
the A/C-heater control.
The A/C-heater control must be recalibrated each time an actuator motor is replaced.
Figure 1 Blend Door Actuator
Operation - Front
OPERATION
The blend door actuators are connected to the A/C-heater control through the vehicle electrical system by a dedicated two-wire lead and connector of the
HVAC wire harness. The blend door actuator(s) can move the blend-air door(s) in two directions. When the A/C-heater control pulls the voltage on one
side of the motor connection high and the other connection low, the blend-air door will move in one direction. When the A/C-heater control reverses the
polarity of the voltage to the motor, the blend-air door moves in the opposite direction.
