Thread: White dust coming out of my vents?

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Originally Posted by jyardgirl

it could be coming from your heater coil. mine was leaking and when i pulled it there was alot of white dust around it from where the antifreeze had leaked out and dried.

I think Barb's right here, and you probably have a very small heater core leak, not enough to drip but getting things wet inside the duct. When it dries the chemicals in the anti-freeze and maybe mineral in the water are left behind, and dry to a dusty deposit.

My first thought was, a police auction car. Previous owner a Bolivian national, maybe?
Just inhale deeply and drive the sucker!