I just bought a used 2020 Ford Fusion Titanium and have noticed a vibrating/rattle sound coming from the B pillar on the driver side behind the seat belt adjuster near the headliner. This sound only happens on the highway and not on bumpy roads in town, making me believe it could be a problem with wind; but I never hear a whistle sound. I've taken the plastic trim pieces off and confirmed its coming from inside the metal structure of the pillar. Does anyone know a fix to this? I've thought about getting some spray foam and carefully filling the pillar structure but am also concerned about anything that is inside getting damaged. Any advice is welcomed, thanks in advance.
