does anyone know where I can find the interior schematics for the Heating and A/C vacuum system for my 2002 E350?

 

See if this helps
[IMG]local://upfiles/6756/A2761B4991214436827509A0A338F6F9.gif[/IMG]
Item
Part Number
Description
1
—
Vacuum to the auxiliary A/C system (if equipped)
2
18A318
Vacuum control motor — floor/panel door
3
—
Panel vent airflow
4
—
Floor/panel door (full vacuum position) (part of 18471)
5
18B545
Temperature blend door (full heat position)
6
19860
Evaporator core
7
19A813
Air inlet 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
18476
Heater core
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
Function selector switch
17
—
Floor air flow
18
18A318
Vacuum control motor — floor/defrost door
19
—
Floor/defrost door (full vacuum position) (part of 18471)
20
—
Defrost airflow

 

Working on 1994 E150 HVAC.
WHERE is the Vacuum Motor located (how can I get to it to replace it) which controls the flow of air to the defrost vents vs the panel vents (plenum)?
This appears to be a common problem for several years and models: after several seconds of low vacuum (hard acceleration), the A/C system switches from cold air coming through the Panel vents, to hot air coming from the Defroster vents.
I think the part number is 18A318, but I have looked in two sets of manuals and cannot find the location (and what else to remove) of the Defrost/Plenum Vacuum Motor. HELP

 

Working on 1994 E150 HVAC.
WHERE is the Vacuum Motor located (how can I get to it to replace it) which controls the flow of air to the defrost vents vs the panel vents (plenum)?
This appears to be a common problem for several years and models: after several seconds of low vacuum (hard acceleration), the A/C system switches from cold air coming through the Panel vents, to hot air coming from the Defroster vents.
I think the part number is 18A318, but I have looked in two sets of manuals and cannot find the location (and what else to remove) of the Defrost/Plenum Vacuum Motor. HELP

You should start your own thread.