Quest 1995-1996

Electric Engine Fan

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Electric Fan Switch



Specific to:

Mercury Villager 1993-2000

Nissan Quest 1993-2000

The radiator cooling fan is controlled by the Powertrain Control Module. For more information on the operation and testing of the system, please refer to the following topic: Engine and Engine Overhaul, Engine Mechanical, Engine Fan, Testing.

Removal & Installation



Specific to:

Mercury Villager 1993-2000

Nissan Quest 1993-2000

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the cooling fan wiring clamp and disconnect the electrical connectors.
  4.  
  5. Remove the left and right cooling fan shroud nuts.
  6.  
  7. Slide the cooling fan up out of the lower mounting slots and remove it.
  8.  
  9. The installation is the reverse of removal.

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    Fig. Disconnect the cooling fan electrical connectors



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    Fig. Removing the left cooling fan shroud nut

  10.  

Testing



Specific to:

Mercury Villager 1993-2000

Nissan Quest 1993-2000


NOTE
For information on understanding electricity and troubleshooting electrical circuits, please refer to Chassis Electrical.


NOTE
Two jumper wires are required for the following tests. An in-line fuse holder with a 30 amp fuse should be spliced in the jumper wire that will be connected to the positive battery terminal to prevent possible damage to the battery, wiring, and components of the circuit being tested.

If a problem with the engine cooling fan system is suspected, check the radiator fan and relay fuses before proceeding with the following tests. For fuse location, rating, and replacement procedure, please refer to Chassis Electrical, Circuit Protection.

Cooling Fan Motor

Specific to:

Mercury Villager 1993-2000

Nissan Quest 1993-2000

To check the engine cooling fan motor:

  1. With the ignition switch OFF , disconnect the cooling fan motor electrical connector.
  2.  
  3. Connect the fused jumper wire between the blue and white wire terminal (pin 2) of the cooling fan electrical connector and the positive battery terminal.
    CAUTION
    When making the following connections, the cooling fan may run. Keep hands, tools, wires, and other objects clear of the fan.

  4.  
  5. Connect one end of the second jumper wire to the negative battery terminal. Connect the other end of the jumper wire to the black wire terminal (pin 3) of the cooling fan electrical connector. The fan should run at low speed. If it does not, replace the cooling fan motor. If it does, check the cooling fan motor high speed operation.
  6.  
  7. Disconnect the negative battery terminal jumper wire from the cooling fan motor black wire terminal (pin 3).
  8.  
  9. Disconnect the fused jumper wire from the blue and white wire terminal (pin 2), and connect it to the blue and red wire terminal (pin 1) in the cooling fan electrical connector.
    CAUTION
    When making the following connections, the cooling fan may run. Keep hands, tools, wires, and other objects clear of the fan.

  10.  
  11. Reconnect the negative battery terminal jumper wire to the black wire (pin 3) of the cooling fan motor electrical connector. The fan should run at high speed. If it does not, replace the cooling fan motor.
    NOTE
    If the 30 amp fuse in the fused jumper wire blows repeatedly during testing, the cooling fan motor is shorted and should be replaced. Be sure to check and replace the radiator fan and relay fuses, as needed, following motor replacement.

  12.  

If the engine cooling fan runs at both low and high speeds during testing, but a problem is still suspected during normal operation, the low and high speed fan control relays can be tested.

Cooling Fan Relay

Specific to:

Mercury Villager 1993-2000

Nissan Quest 1993-2000

The three engine cooling fan control relays are located in the engine compartment fuse and relay panel.

  1. Remove the cooling fan control relay to be tested from the fuse and relay panel.
  2.  
  3. Connect ohmmeter leads to terminal 3 and terminal 5 of the relay.
    WARNING
    Do not allow the positive battery terminal jumper wire clip to contact the ohmmeter leads or negative battery terminal jumper wire clip. Damage to the ohmmeter and/or the relay may result.

  4.  
  5. Connect the fused jumper wire between relay terminal 1 and the positive battery terminal.
  6.  
  7. Connect the second jumper wire between relay terminal 2 and the negative battery terminal.
  8.  
  9. Observe the ohmmeter reading. If it is greater than 5 ohms, replace the relay.

    Click image to see an enlarged view

    Fig. Ohmmeter connections for cooling fan relay testing-1993-95 vehicles



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    Fig. Ohmmeter connections for cooling fan relay testing-1996-97 vehicles



    Click image to see an enlarged view

    Fig. Cooling fan relay terminal identification-1998-00 vehicles

  10.  

Fan Circuit Operation Test

Specific to:

Mercury Villager 1993-2000

Nissan Quest 1993-2000

  1. With the ignition switch OFF , disconnect the engine coolant temperature sensor electrical connector.
  2.  
  3. Turn the ignition switch ON . If the fan does not run, test the cooling fan motor.
  4.  

 
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