Atc switch functions (Air conditioning) (page 2 of 2)

When the ATC is switched on, display may or may not be operating in the mode required or in the wrong units. The following are typical operations which need to be carried out for automatic temperature control:

1. TO CHANGE DEGREES °C or °F Press and release EXT, LED illuminated Press - to change from °C to °F Press + to change from °F to °C To re-display setpoint, press and release EXT
2. TO CHANGE TEMPERATURE SETPOINT To increase by one degree press and release + To decrease by one degree press and release - Press and hold the switch to change by several degrees.
3. TO SELECT BLOWER SPEED Press and release blower switch, LOW blower speed - One bar. Press again, NORMAL blower speed - Two bars Press again, FAST blower speed - Three bars

The next press will give either LOW speed again or, if the compressor is switched off with the ECON switch LED illuminated, will switch off the blower.

NOTE: The blower will always run if the air conditioning system is on.

4. TO SWITCH ON HEATED REAR WINDOW Press and release heated rear window switch when the engine is running. The unit switches off automatically after approximately 10 minutes.
5. TO SELECT OUTSIDE TEMPERATURE Press and release EXT switch. Outside temperature shown in display in the previously selected units. To return to the setpoint display, repress EXT switch. The exterior temperature can be displayed when the ATC system is switched off and the ignition is on.
6. TO SET AUTOMATIC CONTROL Press and release AUTO switch. This will remove any manual overrides and place the blower, distribution, temperature, compressor and fresh/recirculation flap under fully automatic control with regard to the temperature setpoint displayed.
7. TO SELECT MAXIMUM DEFROST Press and release Defrost/demist switch. Press and hold + switch until HI is displayed.
8. TO SELECT MAXIMUM HEATING Press and hold + switch until HI is displayed. Select vent position required.
9. TO SELECT MAXIMUM COOLING Press and hold - switch until LO appears in the display. Select face level vent position and press ECON switch if LED is illuminated.

It should be noted that when a maximum override mode has been selected, the system will run in that setting continuously. Always return to a normal setpoint when the interior temperature is comfortable.

When operating in AUTO mode, the computer will select a setting similar to HI or L0 if the vehicle interior temperature is a long way from the setpoint. It is programmed to achieve the setpoint temperature as fast as possible.