I have a 2005 Ford Freestar that has floor and ceiling vents in the back of the cab. I'm interested in installing a 3rd party external heater and would like to see the ventilation routings to determine if I can connect to existing ventilation system instead of punching holes through the cabin or similar. I found some views for the HVAC equipment E.G. heater core, etc. but ideally would have ventilation views or route mappings.
Can I get diagrams or exploded views of the vent routing and layout? If so where can I find them?