Re: Non air to factory air ??????????
Are you referring to the flapper (air door) inside the cowl vent? It's below the windsheid in the wiper area. That works with the vacuum can on the passenger footwell vent to make recirculated air or fresh depending on the position. Most cabs that I have seen have punch marks from the factory where the holes need to be. I hope I understood what you were talking about.
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