is this a fan clutch problem?
http://www.youtube.com/watch?v=00Y-7q7N_5Y&feature on 2002 Chevrolet Trailblazer

already replaced one

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2 answers
seek diag and est
On a noise like that I would generally us a stethacope to pinpoint. Might try removing belt and inspect all idler bearing and inspect all pulleys. Check front balancer crankshaft bolt.