Ron 3/31/2012

2004 GMC Sierra 3500 SLE 8Cyl6.0L - Engine

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Whirling noise at start up. When temperature is cold. Sounds like a blender.

Only when cold

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  CVO 3/31/2012

  Does this vehicle has a Mechanical (Belt Driven) Fan... Yes,... check the fan clutch.
  
  See this Engine fan and clutch assembly-gasoline engines
  
  http://www.autozone.com/.../...rGuideContent.jsp

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