Envoy, Rainer, Trailblazer 2006-2007

Electric Engine Fan

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Fan Clutch



Removal & Installation

The purpose of the electro-viscous (EV) fan clutch is to maintain powertrain cooling requirements. The control module monitors sensors to regulate the fan speed.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the cooling fan and shroud.
  4.  
  5. Remove the push-pin and release the fan clutch electrical connector from the fan shroud.
  6.  
  7. Remove the fan clutch from the fan shroud.
  8.  
  9. Remove the bolts retaining the fan blade to the fan clutch.
  10.  
  11. Separate the fan blade from the fan clutch.

    Click image to see an enlarged view

    Fig. Separate the fan blade from the fan clutch

  12.  

To install:

  1. Assemble the fan blade to the fan clutch.
  2.  
  3. Install the 4 bolts to the fan blade and tighten them to 20 ft. lbs. (27 Nm).
  4.  
  5. Install the fan clutch to the fan shroud.
  6.  
  7. Install the push-pin to the fan clutch electrical connector.
  8.  
  9. Install the cooling fan and shroud.
  10.  
  11. Connect the negative battery cable.
  12.  

Testing
  1. While the engine is cold, visually inspect the fan blades and replace if there are any signs of damage or cracking.
  2.  
  3. Inspect the fan blade for 1 / 4 or less wobble play and if the amount of play is more than 1 / 4 , replace the fan clutch.
  4.  
  5. Inspect the fan clutch for leaks and replace if leaking is found. Also check for proper tightness on the water pump.
  6.  
  7. Rotate the fan blades and check for resistance. A cold engine should have less resistance than a warm engine.
  8.  
  9. Operate the vehicle until the engine warms up, then shut it off.
  10.  
  11. Rotate the fan blades and check for resistance. The rotating resistance should be more now that the engine has warmed up.
  12.  
  13. Replace the fan clutch if it fails this test.
  14.  

 
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