Town & Country V6-3.8L (2009)
Control Assembly: Description and Operation
Front - Manual Single Zone
MANUAL SINGLE ZONE
The A/C-heater control (1) for the Manual Temperature Control (MTC) single zone heating-A/C system allows one temperature setting for the entire
vehicle. All controls are identified by ISO graphic symbols.
The A/C-heater control (1) is located in the instrument panel and contains:
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a rotary control for blower motor speed selection and to turn the heater-A/C system off (2).
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a rotary control for temperature control of the discharged air (3).
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a rotary control for mode control of the discharged air (4).
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a push-button control for recirculation control of the discharged air (5).
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a push-button control to turn the A/C system on and off (6).
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a push-button control to turn the rear window defogger system on and off (7).
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each push-button control has an indicator lamp that illuminates when selected (6).
The front A/C-heater control utilizes integrated circuitry and information carried on the Controller Area Network (CAN) IHS bus to monitor many
sensors and switch inputs throughout the vehicle. In response to those inputs, the internal circuitry and programming of the A/C-heater control allows it
to control the electronic functions and features of the MTC heating-A/C system.
The front A/C-heater control is diagnosed using a scan tool See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Diagnostic Trouble Code Tests and Associated Procedures.
Prior to replacing an A/C-heater control, check for any Diagnostic Trouble Codes (DTCs) related to the heating-A/C systems and run the calibration
procedure to verify that the concern is not a system issue See: Testing and Inspection/Component Tests and General Diagnostics/HVAC System Test.
The front A/C-heater control cannot be repaired and must be replaced if inoperative or damaged.