WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Vacuum Schematic - Manual Climate Control System
Courtesy of FORD MOTOR CO.
Fig 2: Vacuum Schematic - Manual Climate Control System Parts Description (1 Of 2)
Courtesy of FORD MOTOR CO.
Fig 3: Vacuum Schematic - Manual Climate Control System Parts Description (2 Of 2)