Headlight Doors: Description

Headlight covers are actuated by one vacuum motor on Continental Mark IV, and two vacuum motors on Lincoln, Ford LTD and Mercury. Vacuum is directed to motor (s) by a vacuum distributor valve integral with headlight switch. A reserve vacuum reservoir provides limited headlight cover cycling without engine operating. A check valve is used in vacuum source line to prevent vacuum leakage from reservoir back to engine. Springs are used on all models to automatically open covers in event of vacuum system failure. If headlight covers will not open automatically, a by-pass valve is provided to vent system and allow covers to open.