1983 Ford Crown Victoria & Grand Marquis ATC A/C-Heater Vacuum Diagram

This document is a Mitchell Repair Information scan (printed February 13, 2004, © 2003) showing Fig. 6: the 1983 ATC (Automatic Temperature Control) vacuum diagram for the Ford Crown Victoria and Mercury Grand Marquis A/C-heater system, filed under a 1987 Ford LTD Crown Victoria heading. The diagram traces vacuum hose routing from the vacuum distribution source through the vacuum diverter valve, the harness vacuum connection block (HVCB), and function control connection block (FCCB) to the ATC function selector vacuum valve. Each hose is labeled by color: black, black/purple, black/red, black/yellow, black/blue, black/orange, black/tan, black/white, and black/turquoise. Vacuum motors and components identified include the floor–defrost door vacuum motor, panel full door vacuum motor, panel partial door vacuum motor, servo motor, in-car temperature sensor, temperature control lever, outside–recirculate door vacuum motor, and the thermal blower lockout switch (open below 120°F). Selector positions shown are Panel, Vent, Hi-Lo, Floor, Mix, Defrost, and Off. A lower cutaway locates the heater core, evaporator core, blower motor (–19805), floor-defrost door, panel doors, temperature blend door (cable controlled), and outside-recirc air door, with a legend defining V (vacuum), NV (no vacuum), and PV (partial vacuum).