Item Part Number Description
1 18A318 Vacuum control motorpanel/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 Recirculation air duct door (full vacuum position)
8 Outside air inlet
9 18A318 Vacuum control motorair inlet door
10 Recirculated air inlet
11 19805 Blower motor
12 19A566 Vacuum reservoir tank
13 Vacuum from the engine intake manifold
14 19B888 Function selector switch
15 18495 Heater control valve
16 18476 Heater core
17 18A559 Panel/floor door (full vacuum position)
18 Floor airflow
19 18A318 Vacuum control motorpanel/floor door
20 Panel airflow
NOTE: The two vacuum lines to the vacuum reservoir tank are not interchangeable. NOTE: The A/C vacuum check valve is internal to the vacuum reservoir tank and cannot be serviced separately. ( The check valve should be in the side that Line 13 attaches to.
That's the vacuum schematic. Sorry but I don't have a Trac here to see exactly where that #13 "Supply" connection is located.