For those that put stickers on the hvac controls

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Foggy

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I have one in it, it's they only stop debris not really fumes?

it's funny, we got a 3d printer to play with and the kid wanted a air vent propeller thingy. clips in the vent and spins with air. as you speed up to highway speeds you can see it start spinning from the extra air coming in. The recirculate flap seems to move correctly, and it is worse when not in recirculate. but it's kinda wild haha. never noticed it in any other car.
You can get a replacement filter that has the charcoal in it that does smells, etc
I did the retrofit to put a filter in my Yukon. I found the filter on RA
 

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