What could be the problem if there's a whining noise in the engine? on 2005 Chevrolet Trailblazer

Loud whining noise in the trailblazer,any ideas on what that could be??

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1 answer
wish I could help, we have a 2008 trailblazer with the same problem, everytime we start it up it sounds like a jet engine taking off, then it winds down.