The dual zone A/C system performs the following functions:
The dual zone A/C system is controlled by vacuum and electronic circuits.
Both electronic and vacuum circuits determine air intake and discharge locations.
 Electronic circuits also control the following functions:
|     •  | A/C compressor clutch operation | 
 
|     •  | Discharge air temperature | 
 
The driver may select any of the following functions from the Heater-A/C
control:
|     •  | One of eight different modes of operation | 
 
One of these modes is a fully automatic dual zone mode. In the fully
automatic dual zone mode, the system determines the following conditions:
|     •  | Discharge air temperature | 
 
The system determines these conditions from the following information:
|     •  | The temperature that is selected by the driver or the passenger | 
 
|     •  | Any information that is provided by the system's network of sensors | 
 
The passenger temperature control significantly increases or decreases
the air discharge temperature on the passenger's side of the vehicle.
The passenger control is on the heater A/C control head. The passenger
control is enabled by pushing the DUAL button on the control head.