Function Selector Valve
WARNING: This page is about a different car, the 1995 Ford RV Cutaway, 1995 Ford Econoline, 1995 Ford Cutaway, and 1995 Ford Club Wagon. However, it is still accessible from the selected car via links, so may be relevant.
Place function selector lever in specified position. See Fig 1 . Using a vacuum gauge, check for presence or absence of vacuum as specified. If test results are not as specified, check for kinked or broken vacuum lines. If vacuum lines are okay, replace function selector valve.