RADIATOR FAN - ELECTRIC
DESCRIPTION
The fan (4) is electrically controlled by the powertrain
control module (PCM) through the fan control relays.
The relays are located in the power distribution center
(PDC) in the engine compartment.
OPERATION
The electric radiator cooling fan is controlled by the Powertrain Control Module (PCM) through the radiator cooling
fan relays. The PCM regulates fan operation based on input from the engine coolant temperature sensor, battery
temperature sensor,air conditioning select switch and vehicle speed.
The fan is not energized during engine cranking regardless of the electrical input from the temperature sensors and
air conditioning switch. However, if engine operation conditions warrant fan engagement, the fan will run once
engine starts.
On vehicles NOT equipped with AC: The relay is energized when the coolant temperature is above 80° C (176°
F), or battery temperature sensor above –12° C (10° F). It will then de-energize when coolant temperature drops
below 82° C (180° F), or battery temperature sensor below –9° C (16° F).
Vehicles Equipped with AC: In addition to using coolant temperature and battery temperature sensor to control
cooling fan operation, the cooling fan will also be engaged when the ,air conditioning system is activated. The relay
is also energized when air conditioning is selected and coolant temperature is above 95° C (203° F), or , air con-
ditioning is selected and battery temperature sensor is above 41° C (106° F). It will then de-energize when air con-
ditioning is selected and coolant temperature is below 92° C (198° F), or air conditioning is selected and battery
temperature is below 38° C (100° F).
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ENGINE
KJ