Nobody with a 5.0 has a few minutes to snap me a pic?
I don't have a 5.0, so I'm not much help.
I know on my car, when I moved the climate controls to the lowest stack location I popped a line off behind the dashboard, which forced all the air up through the defroster. The whole system is run off of vaccuum, which does tie into the EGR. So... since you have the diagram, I'd trace the lines, make sure you have no leaks and that the colors do actually correspond to the locations listed.
97 Thunderbird LX (The GT Bird)
PI Swapped NPI motor with some port work on the heads, PI cams, 80mm MAF, CAI that feeds from fenderwell. Jmod, 3.73:1 TL in Mark VIII carrier, Mark VIII aluminum LCAs, 93 Mark VIII driveshaft, PBR brakes (soon to be Cobras), 18x9 wheels, 255/40/ZR18 Tires, Front and Rear strut/shock bracing, GR-2 shocks, Eibach 1.5" springs, 1989 SC front and rear sway bars.