Radiator Cooling Fan: Description and Operation

Coolant fan -V7- and Coolant fan -2- -V177
Function

The cooling system is provided with 2 electric coolant fans:
^ Coolant fan -V7- on left in direction of travel with Coolant fan control module -J293
^ Coolant fan -2- -V177- on right in direction of travel with Coolant fan control module 2 -J671
Both fans are actuated with infinitely variable control by the engine control module via the corresponding coolant fan control module.
^ Contact 66 of the engine control module is the control output for coolant fan control 1
^ Contact 104 of the engine control module is the control output for coolant fan control module 2
The coolant fans are actuated on the basis of the following criteria:
^ Fan request from air conditioner: Fan request is transmitted from air conditioner operating element via CAN bus to engine control module, from where it is relayed directly to fans
^ Normal engine operation: In normal operation and with engine idling, fans are controlled as a function of coolant and ambient temperatures.