RAM 2500 Truck 2WD L6-6.7L DSL Turbo (2010)
OPERATION
The recirculation door actuator is connected to the heater-A/C control module through the vehicle electrical system by a dedicated two-wire lead and
connector of the HVAC wire harness. The recirculation door actuator can move the recirculation-air door 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 recirculation-air door will move in one direction.
When the A/C-heater control makes the voltage to both connections high or both connections low, the recirculation-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 recirculation door actuator and the
recirculation-air door. The A/C-heater control learns the recirculation-air door stop positions during the Actuator Calibration procedure and will store a
Diagnostic Trouble Code (DTC) for any problems it detects in the recirculation door actuator circuits.
The recirculation door actuator is diagnosed using a scan tool See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Diagnostic Trouble Code Tests and Associated Procedures.
The recirculation door actuator cannot be adjusted or repaired and must be replaced if inoperative or damaged.
