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2001 Sierra 2500HD Whiring at back of engine


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I have A 2001 Sierra 2500HD that has a inconsistent whirring issue.

 

When the engine is idling or revving down, I get a whirring that comes from the back of the engine bay. If I tap the gas peddle or turn on the A/C it may go away for a few seconds to a few minutes, no pattern. 
 

This is definitely coming from the engine bay. 
 

Any suggestions on what may be the issue?

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