Commander 2WD V8-4.7L Flex Fuel (2009)
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Auto mode provides variable air recirculation under high temperature and humidity conditions. Because recirculation is generally accompanied by
increased fan noise, the proportion of recirculated to outside air gradually approaches full recirculation over a broad temperature range.
Prior to replacing an A/C-heater control, check for any diagnostic trouble codes (DTCs) related to the heating-A/C system and initiate the Actuator
Calibration function to verify that the concern is not a system issue . See: Testing and Inspection/Component Tests and General Diagnostics/HVAC
System Test
The A/C-heater control for the ATC dual zone heating-A/C system is diagnosed using a scan tool See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures.
The A/C-heater control cannot be repaired or adjusted and must be replaced if inoperative or damaged.
The ATC A/C-heater control utilizes integrated circuitry and information carried on the controller area network (CAN) B bus to monitor many sensors
and switch inputs throughout the vehicle. In response to those inputs, the internal circuitry and programming of the ATC A/C-heater control allows it to
control electronic functions and features of the ATC heating-A/C system.
Some of the inputs received by the A/C-heater control of the ATC heating-A/C system on the CAN B bus are as follows:
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Controlhead backlight dimming
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Refrigerant Pressure
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A/C Clutch Engage
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Vehicle Identification Number
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Vehicle Odometer
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Engine Coolant Temperature
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Ambient Air Temperature
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System Voltage
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Vehicle Speed
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Engine Speed
Some of the messages broadcasted by the A/C-heater control of the ATC heating-A/C system on the CAN B bus are as follows:
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A/C Request
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A/C Select
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EBL Status
Rear
DESCRIPTION
The A/C-heater controls for the manual temperature control (MTC) single zone front and rear heating-A/C system allows both the front and third row
seat passengers the ability to regulate air temperature as well as fan speed and provides a floor outlet near the right rear door and upper air outlets at the
top of each interior quarter trim panel. All controls are identified by ISO graphic symbols.
Prior to replacing an A/C-heater control, check for any diagnostic trouble codes (DTCs) related to the heating-A/C system and initiate the Actuator
Calibration function to verify that the concern is not a heating A/C system issue . See: Testing and Inspection/Component Tests and General
Diagnostics/HVAC System Test
The front and rear A/C-heater controls cannot be repaired or adjusted and must be replaced if inoperative or damaged.
