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Vent making noise
It only happens on really cold days, & only when I go faster then 50mph, so usually on the interstate which I drive daily.
It sounds like it is coming from the vents. Nothing changes when I adjust the heat lower or higher or from feet to defrost, etc.
The noise also slows down or stops if I am behind a semi for example, like the semi is blocking the cold wind from getting in & making the noise.
I have popped the hood & made sure there aren't any leaves or anything between the vent or the hood & nothing.