engine noise

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this occurs with the ac on or off. I cant determine if it is from the bottom or top end, i am leaning more towards the bottom end. I have a appointment at the dealer next week to have a few things checked, I am out of warranty of course, anything you could recomend me bringing to their attention that would be a known issue perhaps. the dealer is quite a ways out for me and i would rather be a bit educated before going out

Thanks for your help.