WARNING: This page is about a different car, the 1999 Lincoln Navigator and 1999 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Automatic A/C-Heater System Wiring Diagram (Expedition & Navigator - 1 Of 3)
Fig 2: Automatic A/C-Heater System Wiring Diagram (Expedition & Navigator - 2 Of 3)
Fig 3: Automatic A/C-Heater System Wiring Diagram (Expedition & Navigator - 3 Of 3)