Vacuum System

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Vacuum Schematic - Manual A/C

Courtesy of FORD MOTOR CO.

Item	Part Number	Description
1	18A318	Vacuum control motor - floor/defrost door
2	-	Defrost airflow
3	18A478	Floor/defrost door
4	18476	Heater core
5	19860	Evaporator core
6	19805	Blower motor
7	-	Outside air inlet
8	19A813	Air inlet door
9	18A318	Vacuum control motor - air inlet door
10	-	Recirculated air inlet
11	18B545	Temperature blend door
12	18A559	Panel door
13	-	Panel airflow
14	18A318	Vacuum control motor - panel door
15	-	Floor airflow
16	-	Vacuum from the engine intake manifold
17	19A563	A/C vacuum check valve
18	19A566	Vacuum reservoir tank and bracket
19	19B888	Function selector switch

Fig 2: Vacuum Connector End View - Manual A/C

Courtesy of FORD MOTOR CO.

Port	Hose Color	Function
1	White	Air inlet door
2	Red	Floor door
3	Yellow	Floor/Defrost door
4	Blue	Panel door
5	Black	Vacuum source
6	-	Not used

VACUUM APPLICATION CHART - MANUAL A/C

Switch Port	Color	Function	Function Selector Switch Position
Switch Port	Color	Function	MAX A/C	NORM A/C	VENT	OFF	FLOOR	MIX	DEF
1	White	Air inlet	V	NV	NV	V	NV	NV	NV
2	Red	Full floor	V	V	V	V	V	NV	NV
3	Yellow	Floor/ defrost	V	V	V	V	V	V	NV
4	Blue	Panel	V	V	V	NV	NV	NV	NV
5	Black	Vacuum source	V	V	V	V	V	V	V
V = Vacuum NV = No Vacuum

Fig 3: Vacuum Schematic - Electronic Automatic Temperature Control (EATC)

Courtesy of FORD MOTOR CO.

Item	Part Number	Description
1	18A318	Vacuum control motor - floor/defrost door
2	-	Defrost airflow
3	18A478	Floor/defrost door
4	18476	Heater core
5	19860	Evaporator core
6	19805	Blower motor
7	-	Outside air inlet
8	19A813	Air inlet door
9	18A318	Vacuum control motor - air inlet door
10	-	Recirculated air inlet
11	18B545	Temperature blend door
12	18A559	Panel door
13	-	Panel airflow
14	18A318	Vacuum control motor - panel door
15	-	Floor airflow
16	-	Vacuum from the engine intake manifold
17	19A563	A/C vacuum check valve
18	19A566	Vacuum reservoir tank and bracket
19	19980	HVAC module

Fig 4: Vacuum Connector End View - Electronic Automatic Temperature Control (EATC)

Courtesy of FORD MOTOR CO.

Item	Part Number	Description
1	White	Air inlet door
2	Yellow	Floor/defrost door
3	Red	Floor door
4	Blue	Panel door
5	Black	Source vacuum
6	-	Not used

VACUUM APPLICATION CHART - MANUAL A/C

Switch Port	Color	Function	Manual Override Selector Buttons
Switch Port	Color	Function	MAX A/C	NORM A/C	VENT	OFF	FLOOR	MIX	DEF
1	White	Air inlet	V	NV	NV	V	NV	NV	NV
2	Yellow	Floor/panel partial	V	V	V	V	V	V	NV
3	Red	Full floor	V	V	V	V	V	NV	NV
4	Blue	Panel	V	V	V	NV	NV	NV	NV
5	Black	Source	V	V	V	V	V	V	V
V = Vacuum NV = No Vacuum