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The fan blade may be loose. You can determine this when the engine is off by moving the fan blade by hand or by watching it rotate when the engine is running. if its a real loud then i would check out the harmonic balancer. to check this. with the engine OFF grab the belt and try and move it back and forth if it does and u hear a noise than its the balancer. i had the same problem i fixed it my self saving $$$$$$$, but it was a pain....u need atleast 2 people to fix this. good luck On my 94 Buick Century the water pumb made a loud clanking noise at idle, which would go away when revved up. A day later the water pump seized up and the belt smoked up a storm where it rubbed over the stuck pulley.

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