Radiator Cooling Fan: Description and Operation

Electric coolant fan, function
Cooling system is equipped with 2 electric coolant fans:
^ Coolant Fan V7 at left in direction of travel with Coolant Fan Control (FC) Control Module J293
^ Coolant Fan 2 V177 at right in direction of travel with Coolant Fan Control (FC) Control Module 2 J671

Both fans are activated continuously via respective Coolant Fan Control (FC) Control Module.
^ Terminal 66 of Engine Control Module (ECM) is the control output to Coolant Fan Control (FC) Control Module J293.
^ Terminal 104 of Engine Control Module (ECM) is the control output to Coolant Fan Control (FC) Control Module 2 J671.

Coolant fans are activated by reason of the following criteria:
^ Fan request from A/C system: A fan request is transmitted by A/C control head via CAN-Bus to Engine Control Module (ECM), it is sent directly to the fans.
^ Normal engine operation: During normal driving operation and engine running at idle, fans are regulated by coolant temperature and ambient temperature.