General Information

General Information

Function of auto recirculation
At outside temperatures of > 26 degrees C, following an initial system ventilation time of 30 seconds, the program switches to recirculation mode in order to accelerate the cooling phase.

Control of the air-conditioning compressor
Activation of the air-conditioning compressor depends on the outside temperature, intake air temperature and coolant temperature.

Activation: - Outside temperature greater than 5 degrees C
- Intake air temperature > 3 degrees C
- Coolant temperature < 115 degrees C
- Ignition on

The air-conditioning compressor is switched on 7 seconds after the engine is started, at the earliest.

Switch-on conditions for coolant or condenser blower motors
Stage 1 is switched on when the coolant temperature is > 100 degrees C or there is an A/C demand, the intake air temperature is > 8 degrees C and terminal 15 is switched on.
Stage 2 is switched on when the coolant temperature is > 105 degrees C or the refrigerant pressure is > 16 bar.

Switch-on conditions for engine compartment fan
The engine compartment fan is switched on when the engine compartment temperature is > 80 degrees C or the coolant temperature is > 102 degrees C.

After-running of engine compartment fan
If the ignition is switched off and the engine compartment temperature is more than 60 degrees C, the DME control module remains in readiness for another 20 minutes. During this time, the engine compartment temperature is retrieved every 10 seconds. If the engine compartment temperature is > 85 degrees C, the engine compartment fan is switched on for 20 seconds. If the engine compartment temperature is still > 85 degrees C after this time, the fan remains on for a further 30 seconds.