Cherokee, Grand Cherokee, 1999-2005

Electric Engine Fan

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Fan Switch



Removal & Installation

NOTE
The Pulse Width Modulated (PWM) cooling fan relay is located below the right headlamp behind the bumper fascia.

  1. Remove front bumper and grill assembly.
  2.  
  3. Remove 1 support bolt near front of reservoir.
  4.  
  5. Remove 2 reservoir mounting bolts.
  6.  
  7. Remove reservoir from vehicle to gain access to vacuum hose. Disconnect vacuum hose from reservoir fitting at rear of reservoir.
  8.  
  9. Disconnect electrical connector at relay.
  10.  
  11. Remove 2 relay mounting bolts and remove relay.
  12.  

To install:

  1. Position relay to body and install 2 bolts. Tighten bolts to 25 inch lbs. (3 Nm).
  2.  
  3. Connect electrical connector to relay.
  4.  
  5. Connect vacuum hose to reservoir.
  6.  
  7. Install reservoir and tighten 2 bolts to 25 inch lbs. (3 Nm).
  8.  
  9. Install front bumper and grill assembly.
  10.  

Testing
  1. Turn the ignition OFF .
  2.  
  3. Remove the relay.
  4.  
  5. Locate the 2 terminals on the relay, which are connected to the coil windings. Check the relay coil for continuity. Connect the common meter lead to terminal 85 and positive meter lead to terminal 86. There should be continuity. If not, replace the relay.

    Click image to see an enlarged view

    Fig. Use an ohmmeter to check for circuit continuity of the coil in the relay

  6.  
  7. Check the operation of the internal relay contacts.
    1. Connect the meter leads to terminals 30 and 87. Meter polarity does not matter for this step.
    2.  
    3. Apply positive battery voltage to terminal 86 and ground to terminal 85. The relay should click as the contacts are drawn toward the coil and the meter should indicate continuity. Replace the relay if your results are different.
    4.  

  8.  

If the relay functions properly during this test, inspect the coolant temperature sensor and the cooling fan system wiring for defects.

Click image to see an enlarged view

Fig. Terminal identification of the most common types of relays. Diodes and resistors in the relay prevent voltage spikes induced when the current is removed from the coil from damaging electronic components



Click image to see an enlarged view

Fig. DIA. 10 - Jeep Grand Cherokee 4.0L/4.7L

Removal & Installation



Cooling Fan Motor
3.7L Engine

NOTE
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.


NOTE
For 3.7L Heavy Duty/Max Cool/Trailer Tow cooling package, the viscous fan cannot be removed separate from the shroud. Both fan and shroud must be removed together.

  1. Disconnect battery negative cable.
  2.  
  3. Using special tool 6958 spanner wrench and 8346 adapters, remove the viscous fan from the water pump .
  4.  
  5. Gently lay fan into shroud.
  6.  
  7. Disconnect the electrical connector for the electric fan, then disconnect connector from shroud.
  8.  
  9. Remove the two fan shroud mounting bolts connecting the fan shroud to the radiator .
  10.  
  11. Remove the shroud and fan from the vehicle.
  12.  

To install:


NOTE
For 3.7L Heavy Duty/Max Cool/Trailer Tow cooling package, the viscous fan cannot be installed separate from the shroud. Both fan and shroud must be installed together.

  1. Gently lay viscous fan into shroud.
  2.  
  3. Install fan shroud assembly into the vehicle. Tighten fan shroud to radiator bolts to 50 inch lbs. (5.5 Nm).
  4.  
  5. Using special tool 6958 spanner wrench and 8346 adapters, install the viscous fan on the water pump.
  6.  
  7. Connect fan motor wire connector to harness connector, and attach connector to shroud.
  8.  
  9. Connect battery negative cable.
  10.  
  11. Start engine and check fan operation.
  12.  

Puller Type

NOTE
It may be simpler to remove the cooling fan(s) with the radiator as an assembly.

  1. Disconnect the negative battery cable.
  2.  
  3. Inspect the cooling fan and take note of any wires, hoses or air conditioning lines that may hamper fan removal. Also at this time, decide whether it is necessary to remove the fan along with the radiator or not.
  4.  
  5. Position aside all wires, hoses and air conditioning lines for fan removal. It may not always be possible to create enough clearance for fan removal by simply moving these obstructions aside; often they must be disconnected. If any cooling system lines must be disconnected, drain and recycle the engine coolant. If any of the air conditioning lines must be disconnected, the air conditioning system will need to be discharged and evacuated by an MVAC-trained technician using an approved recovery machine.
  6.  
  7. Disengage the cooling fan wiring harness connector.
  8.  
  9. If the fan can be removed without the radiator, perform the following:
    1. Loosen the mounting fasteners. Usually there are 2 nuts or bolts along the top edge of the cooling fan shroud and either 2 retaining clips or bolts along the bottom edge.
    2.  
    3. Carefully lift the fan up and out of the engine compartment, making sure that no wires or hoses get hung up on it.
    4.  

  10.  
  11. If it is necessary to remove the radiator for fan removal, perform the following:
    1. Disconnect all cooling system hoses from it after draining the cooling system.
    2.  
    3. Locate the radiator mounting fasteners (usually 2 or more nuts or bolts along the top and, possibly 2 along the bottom).
      NOTE
      Quite a few radiators are secured along the bottom by 2 posts that fit into rubber grommets. The rubber grommets help isolate the radiator from harsh vibrations in the frame. If no nuts or bolts can be located along the bottom of the radiator, chances are that the radiator is secured with the posts and grommets.

    4.  
    5. Lift the radiator and cooling fan up and out of the engine compartment together.
    6.  
    7. Separate the cooling fan from the radiator by removing the attaching fasteners.

      Click image to see an enlarged view

      Fig. To remove a puller type cooling fan, first detach any braces (1), wires (2) or other obstructions



      Click image to see an enlarged view

      Fig. . . . including cooling system hoses, to allow fan removal



      Click image to see an enlarged view

      Fig. Disengage the fan wiring connector(s) .



      Click image to see an enlarged view

      Fig. . . . and loosen all fan mounting fasteners



      Click image to see an enlarged view

      Fig. Separate the fan from the radiator .



      Click image to see an enlarged view

      Fig. . . . then lift the fan up and out of the engine compartment

    8.  

  12.  

To install:

  1. If applicable, install the cooling fan on the radiator.
  2.  
  3. Install the cooling fan and shroud assembly (also the radiator if necessary). Tighten the fan shroud mounting bolts.
  4.  
  5. Reattach all wires, hoses and air conditioning lines as applicable. If the air conditioning lines were detached, the system must be evacuated and recharged by an MVAC-trained technician.
  6.  
  7. If drained, refill and bleed the cooling system.
  8.  
  9. Reattach the cooling fan electrical harness connector.
  10.  
  11. Connect the negative battery cable.
  12.  
  13. Start the engine and check for leaks.
  14.  
  15. Verify the operation of the cooling fan(s).

    Click image to see an enlarged view

    Fig. Typical mounting of a puller type cooling fan assembly utilizing retaining clips and screws-note that this particular model uses a dual puller fan setup



    Click image to see an enlarged view

    Fig. Notice the slots in the bottom of the radiator, in which the fan housing posts rest-common mounting of a puller type cooling fan



    Click image to see an enlarged view

    Fig. This fan mounts to the fan shroud, then the shroud mounts to the radiator-molded clips in the radiator hold the bottom in place and screws at the top



    Click image to see an enlarged view

    Fig. Typically the cooling fan is rubber mounted to isolate vibration and noise-usually the rubber grommets are located at the mount, verify their position before installation

  16.  

Pusher Type

Vehicles that utilize the pusher type of electric cooling fan may require the removal of the grilles and/or upper radiator shroud in order to gain access the fasteners that mount the fan assembly in the vehicle.

  1. Disconnect the negative battery cable.
  2.  
  3. Access the cooling fan.
  4.  
  5. Label and disconnect the cooling fan electrical harness.
    NOTE
    It may be necessary to loosen the mounting bolts for the air conditioning condenser to the body

  6.  
  7. Remove the fasteners that mount the cooling fan to the air conditioning condenser or radiator.
  8.  
  9. Lift the cooling fan out of the vehicle.

    Click image to see an enlarged view

    Fig. After removal of the grill assembly, the pusher type of cooling fan can be removed



    Click image to see an enlarged view

    Fig. It may be necessary to remove the grill assembly to access the air conditioning condenser cooling fan-pusher type

  10.  

To install:

  1. Insert the cooling fan into the vehicle.
  2.  
  3. Mount the cooling fan to the air conditioning condenser or radiator
  4.  
  5. Connect the cooling fan electrical harness.
  6.  
  7. If removed, install any shrouding or grills.
  8.  
  9. Connect the negative battery cable.
  10.  

Testing



  1. Disconnect the negative battery cable.
  2.  
  3. Disengage the cooling fan motor connector.
  4.  
  5. Identify and label the ground and the power terminals of the cooling fan connector using the wiring diagrams provided.
  6.  
  7. Using jumper leads with a fuse in series, apply battery voltage to the appropriate terminals of the cooling fan.
  8.  
  9. The cooling fan should operate. If not, replace the cooling fan.
  10.  

If the cooling fan functions properly during this test, proceed to the cooling fan relay test.

 
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