Radiator Cooling Fan: Description and Operation
RADIATOR FANDESCRIPTION
The radiator fan is a single speed electric motor driven fan. The radiator fan assembly components includes an electric motor, a fan blade, and a support shroud that is attached to the radiator. Each component of the fan assembly can be serviced separately.
Depending on Engine/Transmission combination, the vehicle may be equipped with a single fan (Fig. 21) or a dual fan (Fig. 22).
NOTE: Vehicles equipped with dual fans, each fan blade is different from the other.
OPERATION
Radiator fan control operation is accomplished two ways. The fan will always run when the air conditioning compressor clutch is engaged. In addition to this control, the fan is turned on by the temperature of the coolant which is sensed by the coolant temperature sensor which sends the message to the Powertrain Control Module (PCM). The PCM turns on the fan through a fan relay by grounding the relay's coil. The fan relay is located in the Power Distribution Center (PDC) (Fig. 23). Refer to the label beneath the PDC cover for location of fan relay.
The PCM will actuate the fan relay whenever the A/C clutch is engaged regardless of coolant temperature and vehicle speed. If the A/C clutch is not engaged, the PCM will actuate the fan relay when the coolant temperature reaches approximately (97° C) 207° F and turns off the fan relay when the coolant temperature drops to approximately (94°C) 201° F. The fan relay is also turned off when the vehicle speed is above approximately 100 Km/h (62 MPH). For wiring diagrams of the fan circuit, (Refer to Appropriate Wiring Information).
If the radiator fan is inoperative or a Diagnostic Trouble Code (DTC) related to fan control has been set, (Refer to Appropriate Diagnostic Information) for complete diagnostic procedures.
RADIATOR FAN OPERATION CHART