Dakota 2WD V8-5.9L VIN Z (1998)
Radiator Cooling Fan Motor Relay: Description and Operation
Models equipped with 2.5L engine have an electrical cooling fan. The fan is electrically controlled by the powertrain control module (PCM) through the
fan control relay.
This relay is located in the power distribution center (PDC). For the location of the relay within the PDC, refer to label on PDC cover.
The PCM regulates fan operation based on input from the engine coolant temperature sensor and vehicle speed.
The fan is not energized during engine cranking regardless of the electrical input from the engine coolant temperature sensor. However, if engine
operating conditions warrant fan engagement, the fan will run once engine starts.
The fan is energized whenever the engine is running and the air conditioning compressor clutch is engaged.
When the air conditioning compressor clutch is disengaged, the fan operates at vehicle speeds above 40 mph. This is done if engine coolant temperature
is above 110° C (230° F). The same is true for vehicles that are not equipped with air conditioning. The fan will turn off when coolant temperature drops
to 104° C (220° F). At speeds below 40 mph, the fan turns on when coolant temperature reaches 99° C (210° F) and turns off when coolant temperature
drops to 93° C (200° F).
