Durango, 2001-2005

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.
 

Removal & Installation




CAUTION
If the fan blade is bent, warped, cracked or damaged in any way, it must be replaced only with a replacement fan blade. Do not attempt to repair a damaged fan blade.

  1. Disconnect battery negative cable.
  2.  
  3. Disconnect fan motor wire connector.
  4.  
  5. Remove the two fan shroud mounting clips connecting the upper part of fan shroud to the radiator.
  6.  
  7. Remove fan assembly from radiator.
  8.  

To install:

  1. Install fan assembly onto the radiator. Tighten bolts 5 Nm (45 inch lbs.).
  2.  
  3. Connect fan motor wire connector to harness connector.
  4.  
  5. Connect battery negative cable.
  6.  
  7. Start engine and check fan operation.
  8.  

Testing



  1. If the fan will not run, the easiest test is to disconnect the fan motor lead and apply 12v across the connector. Note polarity as shown in the illustration. If the fan runs, the problem is in the circuit or upstream components.
  2.  
  3. With the ignition and air conditioner ON , check for voltage across the wiring harness side of the fan motor connector. Note polarity as shown in the illustration. There should be 12v at the connector. If there is, the problem is the fan motor. If not, suspect the relay, circuitry, or other upstream component.
  4.  
  5. The PCM will set a diagnostic trouble code in the memory if it detects a problem in the fan relay or circuit, although a DRB scan tool is required for this analysis. If not available, proceed as follows:
  6.  
  7. Check fuses: there is a 10A fuse in the junction block and a 40A maxi fuse in the PDC.
  8.  
  9. Locate the fan relay in the PDC (location is shown on the cover). Apply 12v (with 14-gauge wire) to relay terminal 87. If the fan will not run, check for an open circuit in C25 or Z1. If the circuits are okay, replace the fan.
  10.  
  11. With the ignition key OFF , check for battery voltage at circuit C28 (relay terminal 30). If no battery voltage is present, check for open/short circuit C28 between the PDC and relay.
  12.  
  13. With the ignition key in the RUN position, check for battery voltage at circuit F18 (relay terminal 86). If no battery voltage is present, check for an open/short in circuit F18 between the junction block and the relay.

    Click image to see an enlarged view

    Fig. Note fan polarity before testing

    Note fan polarity before testing
  14.  

 
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