Motor BMW 325i 1992 E36 Manual PDF
Page 450 of 759
640-4
HEATING
AND
AIR
CONDITIONING
Heater
box,
removing
and
installing
The
heater
box,
located
underneath
thecenter
of
the
dash-
board,
houses
theheater
core,
the
A/C
evaporator,
and
asso-
ciated
sensors
and
actuators
.
Removal
of
theheater
box
requires
that
the
A/C
refrigerant
be
discharged
.
CAUTION-
"
Removing
the
heater
box
requires
evacuating
the
AIC
system
.
DO
NOT
attempt
this
procedure
without
proper
tools
and
training
.
"
Any
person
who
services
a
motor
vehicle
air
con-
ditioner
must,
by
law,
be
properly
trained
and
cer-
tified,
and
use
approved
refrigerant
recycling
equipment
.
Technicians
must
complete
an
EPA-
approved
recycling
course
to
be
certified
UU12639
Fig
.
10
.
Heater
core
mounting
nuts
at
left
sideof
bulkhead
(arrow)
.
1
.
Drain
engine
coolant
.
See
170
Radiator
and
Cooling
wiper
assembly
shown
removed
for
clarity
.
System
.
2
.
Remove
complete
dashboard
.
See513
Interior
Trim
.
3
.
Remove
blower
motoras
described
earlier
.
4
.
Remove
nut
retaining
water
hose
flange
to
rear
bulk-
head
.
I'ush
flange
to
one
side
.
See
Fig
.
9
.
Fig
.
9
.
Nut
retaining
coolant
hose
flangeat
bulkhead
(arrow)
.
NOTE-
Clear
any
remaining
coolant
from
the
heater
core
by
blowing
compressed
air
finto
the
coolant
feed
hose
.
HEATER
AND
CONTROLS
0012638b
6
.
Cut
wire
tie
holding
wire
harness
to
heater
box
and
dis-
connect
cable
harness
connector
from
heater
box
.
See
Fig
.
11
.
0012647
Fig
.
11
.
Harness
connectors
(A)
and
cable
tie
(B)
at
heaterbox,
under
driver
side
dash
.
7
.
Followingmanufacturer's
instructions,
connect
ap-
proved
refrigerant
recovery/recycling/recharging
unitto
A/C
system
and
discharge
system
.
8
.
Unbolt
A/C
refrigerantlines
flange
from
engine
bay
bulkhead
.
See
Fig
.
12
.
9
.
On
models
with
rotary-knob
A/C
control
head
:
Discon-
5
.
Remove
nuts
from
heater
box
retaining
bracket
on
en-
nect
wiring
harness
connectors
to
A/C
control
module
gine
bulkhead
left
side
.
See
Fig
.
10
.
Repeat
procedure
in
center
console
and
remove
module
.
See
Fig
.
13
.
for
right
side
nuts
.
Page 455 of 759
Sensor
fan
Fig
.
25
.
Digital
display
A/C
control
head
components
.
2
.
Unscrew
left
and
right
screws
retaining
control
head
to
control
module
.
Press
retaining
clips
and
release
front
plate
from
control
head
.
Remove
A/C
control
module
from
control
head
housing
.
Sensor
fan
for
interior
temperature,
repiacing
A
small
electricfan,installed
in
the
A/C
control
head,
draws
cabin
air
past
the
climate
control
temperature
sensor
.
1.
Remove
A/C
control
head
as
described
earlier
.
2
.
Rotary-knob
control
head
:
Disconnect
electrical
con-
nector
from
top
of
control
head
housing
.
Pry
open
plas-
tic
housing
and
remove
sensor
fan
.
See
Fig
.
26
.
0013181
Fig
.
26
.
Sensor
fan
(A)
and
harness
(B)
in
back
of
A/C
control
head
(rotary-knob
control
head
shown)
.
3
.
Digital
display
models
:
Disconnect
electrical
harness
connector
from
control
head
housing
.
Remove
screws
holding
sensor
fan
to
bottom
of
control
moduleand
re-
move
.
Refer
to
Fig
.
25
.
4
.
Installation
is
reverse
of
removal
.
HEATING
AND
AIR
CONDITIONING
640-
9
Heater
and
A/C
Air
Distribution
Motors
The
recirculation,
fresh
air
and
othervent-duct
flaps
are
controlled
electrically
via
a
series
of
air
distribution
actuating
motors
.
Cars
with
the
rotary-knob
control
head
use
three
elec-
tromechanical
motors,
each
held
in
place
via
a
small
plastic
clip
.
See
Fig
.
27
.
Rightside
of
heater
box
l
Fig
.
27
.
Location
of
early
production
air
distribution
motors
(arrows)
.
Later
systems
(with
the
digital
display
control
head)
use
five
distribution
motors,
four
of
which
are
digítally
controlled
.
See
Fig
.
28
.
HEATER
AND
CONTROLS
Page 456 of 759
640-10
HEATING
AND
AIR
CONDITIONING
i
El
Radio
Antenna
Rear
.
,
si,-
Left
side
I
d
1
.
Rear
vents
2
.
Fresh
air
3
.
Face-level
vents
4
.
Recirculation
5
.
Footwell
vents
0013017
Fig
.
28
.
Location
oflate
production
air
distribution
motors
in
heater
box(shown
in
rear,
side
and
top
views)
.
Heater
andA/C
air
distribution
motor,
replacing
(rotary-knob)
1
.
Toaccess
left
side
motors
(dash
vent
mixing
or
recircu-
lation
flap),
remove
lower
dash
panel
and
knee
bolster
on
driver
side
.
See
513
Interior
Trim
.
2
.
To
access
right
side
motor
(fresh
air
flap),
remove
glove
compartment
.
See513
Interior
Trim
.
3
.
Each
motor
can
be
removed
after
its
electrical
wiring
harness
connector
has
been
removed
.
Squeeze
plastic
clip
to
release
motor
.
See
Fig
.
29
.
Fig
.
29
.
A/
C
air
distribution
motor
plastic
retaíning
clip
(arrow)
.
Re-
lease
clip
and
tilt
motor
out
of
housing
.
Rear
Window
Defogger
0011877
The
rear
window
defogger
switch
is
integrated
with
the
heating
andA/C
control
head
.
HEATER
AND
CONTROLS
Fig
.
30
.
Wiring
diagram
of
rear
window
defogger
and
radio
antenna
.
Rear
Window
Blower
(Convertible
Models)
A
blower
fan,
fitted
into
the
rear
seatback,
defogs
therear
window
.
It
will
only
operate
with
the
engine
nunning
and
the
top
raised
.
A
microswitch
behindthe
rear
seats
provides
the
signal
that
thetop
is
raised
.
To
access
the
blower
fan
motor,
it
is
necessary
to
remove
four
screwsfrom
the
center
seat
back
.
Remove
the
wiring
har-
ness
connector
and
motor
mounting
boits,
then
remove
motor
by
pulling
it
down
and
forward
.
See
Fig
.
31
.
ri
Suppressor
filter
1
0013005
Fig
.
31
.
Rear
window
blower
in
center
of
rear
seat
back
(arrow)
.
The
electric
rear
window
defogger
is
integrated
with
the
ra-
dio
antenna
.
See
Fig
.
30
.
y
/f
0013014
Page 457 of 759
To
access
the
rear
window
blower
relay,
remove
the
glove
compariment
.
See
Fig
.
32
.
Fig
.
32
.
Rear
window
blower
relay
located
in
frontof
glove
compart-
ment
(arrow)
.
AIR
CONDITIONING
Thissection
covers
removal
and
installation
of
air
condition-
ing
refrigerant
components
.
A/C
testing
and
diagnosis,
refrig-
erantdischarge,
evacuatíon
and
recharge
are
not
covered
here
.
The
subassemblies
and
lines
of
the
air
conditionerare
filled
with
either
refrigerant
R12
(1992
cars)
or
R-134a
(1993
and
later
cars)
.
The
major
components
of
the
A/Csystem
are
shown
in
Fig
.
33
.
A/CSystem
Warnings
and
Cautions
WARNING
-
"
Always
be
careful
that
refrigerant
does
not
come
in
contact
with
your
skin
.
Always
wearhand
andeye
protection
(gloves
and
goggles)
when
work-
ing
around
the
AIC
system
.
If
refrigerant
does
come
in
contact
with
your
skin
oreyes
:
-Do
not
rub
skin
oreyes
;
-Immediately
flush
skin
oreyes
withcool
water
for
15
minutes
;
-Rush
to
a
doctor
orhospital
;
-Do
not
attempt
to
treat
yourself
.
"
Work
in
a
wefl
ventilated
area
.
Avoid
breathing
re-
frigerant
vapors
.
Exposure
may
irrítate
eyes,
nose,
and
throat
.
Switch
on
exhaustlventilation
systems
when
working
on
the
refrigerant
system
.
"
Do
not
expose
any
component
of
the
AIC
system
to
high
temperatures
(Above
80°Cl176°F)or
open
flames
.
Excessive
heat
will
cause
a
pres-
sureincrease
whichcould
burst
the
system
.
HEATING
AND
AIR
CONDITIONING
640-
1
1
0013015
WARNING
-
"
Keep
refrigerant
away
from
open
llames
.
Poison-
ous
gas
will
be
produced
if
it
bums
.
Do
not
smoke
near
refrigerant
gases
for
the
same
reason
.
"
The
AICsystem
is
filled
with
refrigerant
gas
which
is
under
pressure
.
Pressurized
refrigerant
in
the
presenceof
oxygen
may
forma
combusti-
ble
mixture
.
Never
introduce
compressed
air
finto
any
refrigerant
container
(full
or
empty),
capped
off
AIC
component,
or
piece
of
service
equip-
ment
.
"
Refrígerant
gases
are
heavier
than
air,
displace
oxygen
and
may
cause
suffocation
in
areas
of
poor
círculation,
for
example
under
a
car
.
Switch
on
exhaustlventilation
systems
when
working
on
the
refrigerant
system
.
"
State
and
local
governments
may
have
additional
requirements
regarding
air
conditioning
servic-
ing
.
Alwayscomply
with
state
and
local
laws
.
"
Electric
welding
near
refrigerant
hoses
causes
R-134a
to
decompose
.
Discharge
system
before
welding
.
CA
UTION
-
-As
of
January
1,
1992,
any
person
who
services
a
motor
vehicle
air
conditioner
must,
by
law,
be
properly
trained
and
certified,
and
use
approved
refrigerant
recycling
equipment
.
Technicians
must
complete
an
EPA-approved
recycling
course
to
be
certified
.
"
It
is
recommended
that
al¡
system
refrigerant
AIC
refrigerant
be
left
to
an
authorized
BMW
dealer
or
other
qualified
AIC
service
facility
.
"
Do
not
top
off
a
partially
charged
refrigerant
sys-
tem
.
Dischargesystem,evacuate
and
then
re-
charge
system
.
"
R-134a
and
R-12
refrigerants
and
refrigerant
oils
and
system
components,
including
hoses
and
sealing
O-rings,
are
NOT
compatible
.
Compo-
nent
damage
andlor
system
contamination
will
result
.
"
The
mixture
of
refrigerant
oil
(PAG
oil)
and
refrig-
erant
R-134a
attacks
some
metals
and
alloys
(for
example,copper)
and
breaks
down
certain
hose
materials
.
Use
only
hoses
and
lines
that
are
iden-
tified
with
a
green
mark
(stripe)
or
the
lettering
R-
134a"
.
"
Immediately
plug
open
connections
on
AIC
com-
ponents
to
prevent
dirt
and
moisture
contamina-
tion
.
"
Do
not
steam
clean
condensers
or
evaporators
.
Use
only
cold
water
or
compressed
air
.
AIR
CONDITIONING
Page 489 of 759
EKE
Power
1992-
VIO
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BRAKELIGHT
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64776
Page 490 of 759
CALWIRING
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1992-93
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I
I
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I
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CRASH
HAZARD
CENTRAL
WIPER
WIPER/
LIGHT
RIGHTPARK/
ABSPUMP
CONTROLFLASHER
LOCKING
RELAY
WASHER
SWITCH
LICENSEPLATE
MOTORRELAV
MODULE
RELAY
MODULE
MODULE
(USA)
LIGHTRELAV
(CANADA)
64784
Page 495 of 759
8317
4
FROMIGNITION
T
VIO
FROM
IGNITION
U
VIO
"I"
IGNITION
SWITCH
SWITCH
SWITCH
(DIAGRAM2OF5)
29
(DIAGRAM20F5)
31
(DIAGRAM20F5)
FROMIGNITION
GRIN
PROMIGNITION
SWITCH
SWITCH
(DIAGRAM20F5)
~(DIAGRAM20F5)
REVERSING
LIGHT
SW
TO
DATA
LINK
CONNECTOR
Power
Distribution
1994-95
Except
318ti
(3
of
5)
______________________________________________
-_-
FRONTPOWER
ELECTRICAL
WIRING
DIAGRAMS
ELE-11
3
FUSE
FUSE
I
DISTRIBUTION
BOX
F46
F18
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141
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16/
11
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ON-BOARD
CHECKCONTROL
WIPER
WIPERMOTOR
INSTRUMENT
BRAKELIGHT
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CONTROL
CRUISECONTROL
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COMPRESSOR
NORMAL
HIGH
COMPUTERMODULE
RELAY
RELAY
CLUSTER
SWITCH
MODULE
SWITCH
MODULE
CONTROL
SPEEDSPEED
(EWSIN
RELAYRELAYRELAY
(1995)
,FRONT
(POWER
DISTRIBUTION
FUSE
FUSE
FUSE
(BOX
FUSE
I
F24
F25
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5A
10A
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------------------
-
-------
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LOWBEAM
LIGHT/LICENSE
LIGHT
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LIGHT
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LIGHT
PLATE
LIGHT
RELAY
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STARTER
(
(1995)
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994)
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WIOEGSONLV
--
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(CANADA)
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(1994
LATE
(1894)
(1994)
(1
994
)
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SERVOTRONIC
CONTROLMODULE
(1995)
FROM
FRONTPOWER
I
FU
SEF24
I
DISTRIBUTIONBOX
I
(DIAGRAM
30F5)
FUSE
FUSE
FUSE
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INTEGRATED
COMBINATION
INSTRUMENT
PEAR
MULTI-
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SLIP
CONTROL
LIGHT
ASC
ABSSLIP
ASS
RELAY
CLIMATE
SWITCH
CLUSTER
DEFOGGER
FUNCTION
RELAY
MODULE
(AB
S)
SWITCH
SWITCH
CONTROL
REGULATION
RELAY
CLOCK
(1995)
MODULE
CONTROL
MODULE
INSTRUMENT
CLUSTER
Page 496 of 759
ELE-12
ELECTRICAL
WIRING
DIAGRAMS
------------------------------------------------
I
FUSE
FUSE
F6
F7
Power
Distribution
1994-95
Except
318ti
(4
of
5)
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_____-__________________-____________-__~FSONTPOWER
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WASHER
SWITCH
LICENSEPLATE
MOTORRELAYTOPCONTROLMODULE
RELAY
MODULE
CONTROLMODULE
MODULE
(USA)
LIGHTRELAY
MODULE
(ZKE
IV)
(CANADA)
(1995)
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(1994)
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SOCKET
LIGHTRFLAY
MAP
LIGHT
WINDOW
(CANADA)
ASSEMBLY
MODULE
(1994)
FROM
RED
RED/WIT
FRONTPOWER
F
DISTRIBUTION
BOX
RED/W
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(ZKE
IV)
Page 500 of 759
ELE-16
ELECTRICAL
WIRING
DIAGRAMS
88978
TO
FUSE
F16
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4
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5)
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1996-97
Except
318ti
(3
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5)
ELECTRONICIMMOBLIZER
CONTROL
MODULE
(EWS11)
NOTUSED
2_
.
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CLUSTER
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DULE(DME)
RELAY
CLUSTER
°_
(1996)
-----
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MODULE
(1996
CANADA)
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CANADA)
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COMPARTMENT
TELEPHONE
CONNECTOR
LEF7MAKEUP
CONVERTIBLETOP
TELEPHONE
SEAT
SWITCH
FRONTDOME/
ANTI-THEFT
RIGHTMAKEUP
REAR
(1997)
MI
PROFLIGHT
CONTROLMODULE
TRANSCEIVER
OCCUPANCY
SPATIALSOUND
MAPLIGHT
CONTROLMODULE
MIRROR
LIGHT
INTERIOR
(1996)
DETECTOR
ASSEMBLY
(199fi)
FROMFISE
141
---
(DIAGRAM
30F5)
M
________--_--_________________-_----------------
FRONTPOWER
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CRUISECONTROL
TRANSMITTER
COMPUTER
CONTROL
RELAY
MOTOR
IMMOBILIZATION
MODULE
CLUSTER
SWITCH
MODULE
SWITCH
MODULE
MODULE
(1996)
RELAY
SWITCH
(1996)
(1998)
(1997)
0
TALINK
CONNECTOR
Page 502 of 759
ELE-18
ELECTRICAL
WIRING
DIAGRAMS
RED
FROM
RED
FROM
D
FRONT
POWER
~H
FRONTPOWER
DISTRIBUTION
BOX
DISTRIBUTION
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1996-97
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