Thanks BC59. You know that actually makes sense, and it does suck air when the brake isn't pressed. So it looks like I will need to rebuild the HVAC system as well? I can say one thing, this truck stops on a dime! I figure for now I'll put the filter on and come back to the HVAC system later. I have other things to do on the truck first, LOL.......Please let me know if you want to part with the filter when you find it.
