Aspen 2007, Durango 2005-2007

Electric Engine Fan

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2001-03 models incorporate an auxiliary electric fan to aid low-speed cooling. Fan operation is controlled by the PCM through a relay located in the Power Distribution Center (PDC). The PDC is in the engine compartment on the left fender inner shield. The location of the fan relay is given on the inside of the PDC cover.

The fan relies upon several inputs to determine operation, notably the coolant temperature sensor .



The fan will run whenever the engine is running and the air conditioner compressor clutch is engaged.
 
When the air conditioner compressor clutch is disengaged, the fan will run at vehicle speeds above 40 mph if coolant temperature is above 230°F (110°C). The same is true of vehicles without air conditioning.
 
The fan will turn off when coolant temperature drops to 220°F (104°C).
 
At speeds below 40 mph, the fan turns on when coolant temperature reaches 210°F (99°C) and turns off when coolant temperature drops to 200°F (93°C).
 
The fan will not run during engine cranking.
 

 
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