Non air to factory air ??????????
 

I want to put the factory air out of my parts truck into my daily driver. I've read the FAQ's section and I know about the three difference in the cabs. The inside dash holes, the fire wall holes, I have figured out, but what about the third hole for the flapper{ I think}, any info on that one??? That's the hole I haven't read too much about. Please help me,,,, Thanks

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.

Re: Non air to factory air ??????????
 

If that is the one your talking about my firewall had center punch marks on it.I just drilled them out to the size I needed and my old parts fit right in

Re: Non air to factory air ??????????
 

Yes ,that's it, thanks.