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2002 Trailblazer LS
there’s an awful rod knock type sound when it’s running with the belt on, as soon as I take the belt off, no noise. Also, the noise fluctuates with rpm’s.
 

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2002 chevy trailblazer_lt
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174 Posts
With the belt off an engine off spin each component by hand and listen. Water pump, alternator, a/c compressor and so on
 
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