General Information

General information

Function of auto recirculation
At outside temperatures > 26 °C the program, after an initial system ventilation time of 30 seconds, 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 e 5 °C
- Intake air temperature > 3 °C
- Coolant temperature < 115 °C
- Ignition on

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

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 if the coolant temperature > 105 °C

or

the refrigerant pressure is > 16 bar.

Switch-on conditions for engine compartment blower
The engine compartment blower is switched on when the engine compartment temperature is > 80 °C

or

the coolant temperature is > 102 °C.

After-running of engine compartment blower
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 interrogated every 10 seconds. If the engine compartment temperature is > 85 °C, the engine compartment blower is switched on for 20 seconds. If the engine temperature is still > 85 °C afterward, the time is extended by a further 30 seconds in each case.