Control Assembly: Description and Operation

DESCRIPTION

The A/C-heater control for the Manual Temperature Control (MTC) single zone system allows one temperature setting for the entire vehicle. All controls are identified by ISO graphic symbols.

The heating-A/C system uses a dedicated microprocessor to drive the electrically operated door actuators. This control provides the vehicle operator with a number of setting options to help control the climate and comfort within the vehicle.





The A/C-heater control (1) is located in the instrument panel and contains:

- a rotary control for blower motor speed selection and to turn the heating-A/C system off (2).
- a rotary control for temperature control of the discharged air (3).
- a rotary control for mode control of the discharged air (4).
- a push-button control with an indicator lamp to turn the rear window defogger system on and off (5).
- a push-button control with an indicator lamp to turn the A/C system on and off (6).
- a push-button control with an indicator lamp for recirculation control of the discharged air (7).

Prior to replacing an A/C-heater control, perform the HVAC System Test HVAC System Test and the Actuator Calibration function to verify that the concern is not an air-door calibration issue HVAC Actuator Calibration Procedure.

The A/C-heater control and A/C system and is diagnosed using a scan tool Testing and Inspection.

The A/C-heater control cannot be adjusted or repaired and must be replaced if inoperative or damaged.