What would be the cause of a slight noise like a fan hitting radiator blades on 2005 Mercedes-Benz S430 4MATIC

When I start up a hill it is worse than otherwise but it is there when I take off

by in Sayreville, NJ on September 16, 2013
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1 answer
ANSWER by , September 16, 2013
poss weak or bad motor mounts,motor is lifting and fan could be hitting fan shroud