The automatic A/C control head uses the following types of manual controls:
• | Push buttons provide control of the mode and the blower speeds. |
• | Two rotary knobs can set the temperature. |
In the automatic mode the temperature is set by the driver. A microprocessor uses this information to provide the desired temperature level. The driver can change the blower speed and mode selection at any time. The microprocessor continues to moderate the blower speed and temperature. Diagnostic testing is performed with a scan tool or through the DIC.
The digital display shows readings in Fahrenheit or Celsius by pressing the E/M button (English/Metric) on the Driver's Information Center (DIC). When the vehicle is started, the display will show the current fan speed, air delivery mode and the driver's set temperature for approximately five seconds and then show the outside temperature.
When the system is fully in the automatic mode, the word AUTO will appear on the display. If the driver has selected a manual fan speed, the fan symbol will appear on the display along with the corresponding fan speed. If a manual air delivery mode has been selected, the delivery mode symbol will appear on the display.
The DRIVER knob changes the temperature on the driver's and passenger's side of the vehicle. Turn the knob to the right to increase the temperature and to the left to decrease the temperature. Whenever the DRIVER knob is turned, the temperature will be displayed for approximately five seconds along with the current fan speed and air delivery mode.
When the AUTO mode is chosen, start with a driver's set temperature of 23°C (73°F) and then adjust accordingly until the appropriate comfort zone has been reached. If the driver's set temperature is at 16°C (60°F), the system will remain at maximum cooling and will not automatically adjust fan speed or air delivery. If the driver's set temperature is at 32°C (90°F), the system will remain at maximum heating and will not automatically adjust fan speed or air delivery. Choosing either maximum setting will not cause the system to heat or cool any faster. Turning the knob past either maximum setting has no effect on the operation of the system or temperature display.
The PASSENGER knob changes the temperature on the passenger's side of the vehicle. When the knob is in the 12 o'clock position, the passenger's temperature is the same as the driver's side. The knob can be turned to the right for warmer air on the passenger's side or to the left for cooler air. If the driver's set temperature is set at 16°C (60°F) or 32°C (90°F), turning the passenger's knob will have no effect because the system is locked at a maximum setting.