RAM 3500 Chassis Cab Truck 2WD L6-6.7L DSL Turbo (2010)
air doors, as they are electronically calibrated by the A/C-heater control.
Mode Door Actuator - Operation
OPERATION
The mode door actuators are connected to the A/C-heater control through the vehicle electrical system by dedicated two-wire leads and connectors of the
HVAC wire harness. The mode door actuators can move the defrost-air door and the panel/floor-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 mode-air door will move in one direction. When the
A/C-heater control reverses the polarity of the voltage to the motor, the mode-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 mode-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 mode door actuators and the mode-air
doors. The A/C-heater control learns the mode-air door stop positions during the Actuator Calibration procedure and will store a Diagnostic Trouble
Code (DTC) for any problems it detects in the mode door actuator circuits.
The mode door actuators are diagnosed using a scan tool See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Diagnostic Trouble Code Tests and Associated Procedures.
The mode door actuators cannot be adjusted or repaired and must be replaced if inoperative or damaged.
Recirculation Door Actuator - Description
DESCRIPTION
The recirculation door actuator (1) is a reversible 12-volt direct current (DC) servo motor. The single recirculation door actuator is located on the
passenger side end of the HVAC housing (2), on the top of the air inlet housing.
