General Information

General Information

Function of auto recirculation
At outside temperatures of [>] 26 °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 [>]= 5 °C
- Intake air temperature [>] 3 °C
- Coolant temperature [<] 115 °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 ° C

or

there is an A/C demand, the intake air temperature is [>] 8 °C and terminal 15 is switched on.

Stage 2 is switched on when the coolant temperature is [>] 105 °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 °C

or

the coolant temperature is [>] 102 °C.

After-running of engine compartment fan
If the ignition is switched off and the engine compartment temperature is more than 60 °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 °C, the engine compartment fan is switched on for 20 seconds. If the engine compartment temperature is still [>] 85 °C after this time, the fan remains on for a further 30 seconds.