Function
The pushbutton control module transfers the input information on the coolant temperature and/or refrigerant pressure to the auxliary fan control module. The control current for the auxiliary fans is 0 to 10 mA
The auxiliary fan control module compares these values with the values stored and switches the auxiliary fans (M4) ON and OFF under the conditions listed in the table below
Auxiliary fan switching points | min. actuation | max. actuation |
Refrigerant pressure bar | 14 ON 12 OFF | 20 ON 18 OFF |
A/C coolant temperature sensor °C | 103 ON 98 OFF | 115 ON 110 OFF |
Auxiliary fan (M4) actuation mA | approx. 2 | 10 |