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2004 Chevrolet Trailblazer

Question: start up noise

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mamadeb, 4.2L 6 Cylinder, Cedar Bluff, AL, June 26, 2010, 21:06

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when first starting a humming sound underneath truck then winds down . is this the fuel pump. no problems just never paid attention to it

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• Answer #1

  klint June 26, 2010, 21:37
  

   Enthusiast

  yes its the feul pump priming the chambers
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  Visitor, October 12, 2010, 19:13

  unfortunatly that is not the problem... there is a fan located under the truck. It is used in emissions controls, and the sound you are hearing is the motor for the fan going bad... i had mine replaced 3 times before i said the hell with it. It clogs with mud, ice what ever and burns up.... thanks alot chevy
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  mamadeb, October 13, 2010, 06:53
  

   Rookie

  WILL THIS CAUSE ANY PROBLEMS IF NOT REPLACED??
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