Ever since my model 3 was new I've had a rattle tied to the front dash speaker grill. The rattle seems to be worse when the car is cold. I even had mobile service come out to investigate, but of course it didn't rattle. I ended up taking apart the entire dash trying to figure this out. What I realized (after applying sound deadening material, foam tape, etc) is that the grill itself was causing the rattling sound. What finally solved my issue was applying 1/2" thick neoprene foam weather sealing tape between the grill and the windshield (which you can barely see in the attached photo circled in red)
. That seems to dampen the vibrations that caused the rattle. Hopefully this will help others.
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