There is a note in the FSM regarding noise complaints and the idler bearing. #2 in post 2 here: Idler arm repair kit order

As described above, the specific location and character of the noise is important to troubleshooting. A groan, a squeak, a squeal, etc; behind the glove box, at the driver's feet; over bumps, when turning...

When trying to locate hard to find rattles or noises, I found it useful to have someone else drive while you listen from the passenger seat or the rear seat. That way you can move around and you're not worrying about traffic or running into anything while turning your head sideways.