Hi all!
I want to share with you two simple solutions that I applied to my 2022 model 3 to stop rear rattling.
The first rattling came from the central hinge of the rear seat backrest, that has a huge backlash leaving the seat rattle at low speeds.
To avoid this I put a small plank (1.5 cm thickness X 30 cm length) covered by adhesive car carpeting.
View attachment 872246This completely stopped the rattling.
The only small downside is that I have to put in place the plank every time I fold down the seats (not a real issue for me).
The second rattling, in fact more a vibration than a rattle, came from the parcel shelf.
I first tried to put some foam in the middle of the panel, between the metal and the plastic/fabric layers (I just accessed the space between the two layers unlocking the two snap buttons just where the rear backrest lies when up), but the vibration stayed here.
So I took a piece of three-core electrical cable (10 mm diameter), around 40 cm length, and I rolled it up with two layers of the same adhesive car carpeting that I used before, then I pressed it (with my bare fingers) in the small rail between the parcel shelf and the rear window:
View attachment 872249
This is completely invisible from the exterior (and almost from the interior) because it blends with the black of the window frame.
But, the important thing, it fully cancelled the noisy vibration.
I hope my ideas be useful for you.
Michele