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my 1985 mercury marquis brougham 3.8l v6 started making alot of noise recently ani just found where it is coming from. its the wheel right under the alternator. what is that and what does it do

the little pulley is more

the little pulley is more than likely the idler pulley if it does seize up than the belt will break, you should be able to find the pulley at any one of your auto parts store for about $50.00.

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