Ford F-150 1999 - Manual A;C Vacuum System Diagrams; Vacuum Schematic and Connector View

Vacuum Connector End View — Manual A/C
Item Part Number Description
1 18A318 Vacuum control motor, panel/defrost door
2 18A478 Panel/defrost door (full vacuum position)
3 — Defrost airflow
4 — Side window demister airflow
5 18B545 Temperature blend door (full heat position)
6 19860 A/C evaporator core
7 19A813 Air inlet duct door (full vacuum position)
8 — Outside air inlet
9 18A318 Vacuum control motor, air inlet duct door
10 — Recirculated air inlet
11 19805 Blower motor
12 — Vacuum to emission control
13 — Vacuum from the engine intake manifold
14 19A563 A/C vacuum check valve
15 19A566 A/C vacuum reservoir tank and bracket
16 19B888 A/C-heater function selector switch
17 18476 Heater core
18 18A559 Floor/panel door (full vacuum position)
19 — Floor airflow
20 18A318 Vacuum control motor, floor/panel door
21 — Panel vent airflow
Port Hose Color Function
1 White Air inlet duct door
Page 2 of 301999 F-150/250 Workshop Manual
8/16/2010http://www.fordtechservice.dealerconnection.com/pubs/con...