Radiator Fan Relay

Fig. 19 Power Distribution Center (PDC):

PURPOSE
The PCM energizes the radiator fan through the radiator fan relay.

OPERATION
The PCM controls the ground circuit for the solenoid side of the relay Buss bars in the Power Distribution Center (PDC) supply voltage to the solenoid side and contact side of the relay.

The radiator fan power circuit contains a 30 amp fuse between the buss bar in the PDC and the radiator fan relay. The fuse is located in the PDC. Refer to electrical Diagrams for circuit information.

When engine coolant reaches a temperature of 99°C (210°F), the PCM energizes the radiator fan. The PCM turns the fan off when coolant temperature drops to 93°C (199°F).

Whenever the PCM energizes the A/C compressor clutch it engages the fan. Also, to prevent radiator steaming, the PCM energizes the radiator fan at idle following certain cold starts.

The radiator fan relay is located in the PDC (Fig. 19). The inside top of the PDC cover has a label showing relay and fuse location.