Sprinter 2500 V6-3.0L DSL Turbo VIN 45 (2007)
Air Door Actuator / Motor: Description and Operation
Controls - Front
Description
DESCRIPTION
A blend door actuator is used when equipped with the automatic temperature control (ATC) heating-A/C system. The blend door actuator is a reversible,
12-volt direct current (DC), servo motor that is mechanically connected to the blend-air door. The blend door actuator is contained within a black
molded plastic housing (1) with an integral wire connector receptacle (4) and three mounting tabs (2) that allow the actuator to be secured to the driver
side of the HVAC housing. The blend door actuator has an output shaft (3) with a spline that connect it to the blend door linkage. The blend door
actuator requires mechanical indexing to the blend door linkage. The blend door actuator is interchangeable with the mode door and recirculation door
actuators and is electronically calibrated by the A/C-heater control.
The blend door actuator can be accessed for service from underneath the driver side of the instrument panel.
Operation
OPERATION
The blend door actuators are connected to the A/C-heater control through the vehicle electrical system by a dedicated 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.
When the A/C-heater control makes the voltage to both connections high or both connections low, the blend-air door stops and will not move. The
A/C-heater control uses a pulse-count positioning system to monitor the operation and relative position of the blend door actuator and the blend-air door.
The A/C-heater control learns the blend-air door stop positions during the calibration procedure and will store a diagnostic trouble code (DTC) for any
problems it detects in the blend door actuator circuits.
The blend door actuators are diagnosed using a scan tool.
The blend door actuators cannot be adjusted or repaired and must be replaced if inoperative or damaged.
Description
DESCRIPTION
