Escalade, Suburban, Tahoe, Yukon, Denali, DenaliXL, YukonXL 1999-2005

Electric Engine Fan

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Fan Switch



Electric engine cooling fan operation is governed by the PCM, which utilizes engine coolant temperature, air conditioning system pressure and/or certain DTC codes.

Removal & Installation
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the fan relay from the underhood fuse/relay center.
  4.  

To install:

  1. Install the fan relay to the underhood fuse/relay center.
  2.  
  3. Connect the negative battery cable.
  4.  

Testing
  1. Check the condition of the fan switch and wiring. Repair as necessary.
  2.  
  3. Attach one end of a jumper wire to a good 12 volt power source and the other end of the jumper wire to the orange wire at the cooling fan relay.
  4.  
  5. The fan should operate. If the fan does operate the switch is probably defective.
  6.  
  7. If the fan does not operate, unplug the fan electrical harness and apply 12 volts directly to the fan. If the fan does not operate, the fan motor is probably defective. If the fan does operate, the relay could be defective.
  8.  

Removal & Installation



  1. Remove the grille.
  2.  
  3. Unplug the fan harness connector.
  4.  
  5. Remove the fan-to-brace bolts and lift out the fan.
  6.  
  7. Installation is the reverse of removal. Tighten the bolts to 53 ft. lbs. (72 Nm).
  8.  

Dual Electric Fans
  1. Remove the cooling fan and shroud.
  2.  
  3. Remove the cooling fan blade retainers.
  4.  
  5. Remove the cooling fan blades.

    Click image to see an enlarged view

    Fig. Dual electric cooling fans

  6.  

To install:


NOTE
The electric cooling fan assembly uses a 5-blade fan and a 7-blade fan, it does not matter which side the fan blades are installed on. DO NOT install two 5-blade assemblies or two 7-blade assemblies, as this would cause a noise issue.

  1. Install the cooling fan blades.
  2.  
  3. Install the cooling fan blade retainers.
  4.  
  5. Install the cooling fan and shroud.
  6.  

Testing



For testing the auxiliary cooling fan, refer to the cooling fan circuit illustration and the diagnosis chart.

Click image to see an enlarged view

Fig. Auxiliary cooling fan wiring diagram



Click image to see an enlarged view

Fig. Auxiliary cooling fan diagnostic chart

 
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