RAM 2500 Truck 2WD V8-5.7L (2008)
Control Assembly: Description and Operation
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 and integral computer is located in the instrument panel and contains:
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a push button A/C on/off control (2). The Snowflake button contains an LED that illuminates when the A/C system is in operation.
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a push button rear window defogger on/off control (3) when equipped with the optional rear heated window. The defogger button contains an LED
that illuminates when the rear window defogger (EBL) system is in operation.
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a rotary control knob for recirculation and mode control of the discharged air (4).
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a rotary control knob for temperature control of the discharged air (5).
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a rotary control knob for fan speed selection and turning the heating-A/C system off (6).
The 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 .
The A/C-heater control cannot be adjusted or repaired and must be replaced if found inoperative or damaged. The illumination lamps for the A/C-heater
control are available for service replacement.
