Sorry ran out for a bit ... do you ahve a strap wrench ? that could hold the pulley or try tightening up the belts and use some wd40 or equiv on the bolts.... you don't need to take the radiator out just be patient and it will come right out once you get the fan off.

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1987 300D 180k
1985 300SD 330k Helga
1992 300D Lola 269k- Sold
1986 325 coupe Bessie >300k Original engine(ODO Broke) sold
2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it