Manual Temperature Control (MTC) System
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:
- a rotary control for fan speed selection and for turning the heating-A/C system on and off (2). This control also contains a push button function for recirculating the conditioned air. The control contains an indicator lamp that illuminates when the heating-A/C system is in recirculation mode.
- a rotary control for temperature control of the discharged air (3). This control also contains a push button function for turning the A/C system on and off. The control contains an indicator lamp that illuminates when the A/C system is in operation.
- a rotary control for mode control of the discharged air (4). This control also contains a push button function for turning the rear window defogger system on and off. The control contains an indicator lamp that illuminates when the rear window defogger system is in operation.
The A/C-heater control for this heating and A/C system is diagnosed using a scan tool. Refer to DTC-Based Diagnostics/HVAC - Diagnosis and Testing .
Prior to replacing an A/C-heater control, check for any diagnostic trouble codes (DTCs) related to the heating-A/C system and run the Actuator Calibration function using a scan tool to verify that the concern is not a system issue. Refer to DTC-Based Diagnostics/HVAC - Standard Procedure .
The A/C-heater control cannot be adjusted or repaired and must be replaced if inoperative or damaged.