Vehicles without air conditioning
Vehicles without an air conditioning system have a conventional control panel with three controls.
Air recirculation mode is activated by a dip switch (on off.), which controls the executive device (by a DC electric motor).
Vehicles with manual air conditioning
The control panel on vehicles with air conditioning differs from the control panel on vehicles without air conditioning only in that there is an additional two-position switch (on off.) for A/C system.
Air distribution and temperature control - vehicles without electronic automatic air temperature control (EATC)
The air distribution and temperature control dampers are mechanically operated using cables.
Vehicles with electronic automatic temperature control (EATC)
Vehicles with EATC have a control panel that has several switches. Two switches for setting the internal temperature, two switches for fan control, four switches for airflow control and one DIP switch each (on off.) for A/C and air recirculation mode. In addition, the on/off switch (on off.) for EATC and the operating switches for heated windscreen and heated rear window are located on the EATC control panel. The EATC control module is integrated with the control panel. Unlike the manual A/C system, EATC has a self-diagnostic function.
Air recirculation mode is activated by a dip switch (on off.), which controls the executive device (by a DC electric motor).
Air distribution and temperature management - vehicles with electronic automatic air temperature control (EATC)
The air distribution and temperature control dampers are controlled by the EATC control module and actuated by actuators (stepper motors).
| Pos. | Spare Part No | Name |
| 1 | - | Executive device - temperature control |
| 2 | - | Actuator - central ventilation deflector / leg recess deflector |
| 3 | - | Actuator - anti-icing deflector |
Temperature monitoring in the cabin
The EATC control module monitors the interior temperature using a sensor system consisting of four sensors. Two sensors in the heater housing to monitor the outlet temperature, one sensor in the EATC control panel to monitor the interior temperature, and one solar intensity sensor in the instrument panel trim to monitor the amount of sunlight entering the vehicle. In addition, the EATC control module receives information about the current outside temperature from the trip computer. On vehicles with a Duratec - ST engine, the EATC control unit receives information about the current outside temperature via the SCP bus.
Changing temperature units in the EATC display
With EATC enabled, pressing the FAN and AIR RECIRCULATION buttons simultaneously for at least 2 seconds causes the display to switch from Celsius to Fahrenheit.
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