9-3 Coupe (9400) L4-2.0L Turbo (B205) (2001)
With A/C
-
Coolant temperature (bus from Trionic T7)
-
A/C pressure (own pressure gauge)
-
Car speed (bus MIU)
-
Outside temperature (bus from SID)
-
A/C system status (active/inactive)
For more information on the A/C and its control system, refer to Climate system, refer to Heating and Air Conditioning.
When the A/C clutch operates, the radiator fan is activated as follows:
-
Coolant temperature
Low speed is activated when coolant temperature reaches 100°C.
Low speed is turned off when the temperature drops to 96°C.
High speed is activated when coolant temperature reaches 113°C.
High speed is turned off when the temperature drops to 109°C.
-
Outside temperature
Low speed is activated when the outside temperature exceeds 22°C and is turned off when the temperature drops below 20°C.
-
Car speed / A/C pressure
Low speed is activated when car speed is below 38 km/h at the same time as A/C pressure is between 9 and 18 bar. Low speed is turned off when car
speed exceeds 40 km/h or A/C pressure drops below 7 bar.
-
A/C pressure
High speed is activated when A/C pressure exceeds 18 bar and turned off when A/C pressure drops below 14 bar.
Operation with ignition OFF
There is a risk of the coolant overheating even when the ignition is OFF. To prevent this, DICE can activate the radiator fan on the basis of
information from the engine coolant temperature sensor. Coolant temperature information signals occur 30 and 60 seconds after the ignition has been
turned OFF.
Using this information together with radiator fan status at ignition OFF, DICE can activate the fan (low speed if it is a 2-speed fan). The radiator fan
can be activated up to 20 minutes after ignition OFF and can run for up to 3.5 minutes.
Radiator fan does not run when ignition turned from ON to OFF
30 seconds after ignition OFF:
-
The radiator fan starts and runs for 3 minutes if the coolant temperature is 107°C or above. The fan stops after 3 minutes.
-
The radiator fan starts and runs for 30 seconds if the coolant temperature is between 103°C and 107°C.
60 seconds after ignition OFF:
Only applicable if the coolant temperature was between 103° and 107°C 30 seconds after ignition OFF.