If it were just the fan wouldn't it do this in every gear then? Yes I've seen at least one of those upgrade fans on a w123, never really thought about it before though. Oooh, flex disc, better make sure that one doesn't break! ($$$$)

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k