Cooling System: Description and Operation

CIRCUIT OPERATION
Power for the radiator fan solid state relay is supplied on circuit A16. This circuit is HOT at all times and protected by a 40 Amp fuse located in cavity 4 of the Power Distribution Center (PDC).

Ground for the relay is supplied by the Powertrain Control Module (PCM) on circuit K173. The PCM determines the need for radiator fan operation, and the speed at which it operates, by looking at several items including engine coolant temperature and A/C operation.

Circuit C23 connects from the relay to the radiator fan motors. Ground for the fans is supplied on circuit Z1.