FRONT BUMPER NOISE
Some of the clips that attach the the plastic fascia to the bumper frame may have pulled loose. Check that first. I have never had a bumper rattle issue. And by the radiator do you mean the grille by any chance? Check the plastic grille inserts too.
The bumper fascia has two slotted holes underneath at the license plate location. The holes aren’t used for anything (dumb). I went to Advance Auto Parts and bought those large push plugs used for trim etc. and it work perfect. The plugs pushed into the steel bumper behind the fascia. No more shake or noise.


