air condition BMW M3 1994 E36 Repair Manual
Page 462 of 759
640-16
HEATING
AND
AIR
CONDITIONING
A/C
expansion
valve,
removing
and
installing
Fig
.
45
.
Control
module
carrier
retaining
screws
(arrows)
.
1
.
Following
manufacturers
instructions,
connectanap-
proved
refrigerant
recovery/recycling/recharging
unit
to
A/C
system
and
discharge
system
.
WARNING
-
Do
not
discharge%harge
the
WC
system
without
properequipmentand
training
.
Damage
to
the
vehi-
cle
and
personal
injury
may
result
.
2
.
Remove
glove
compartment
and
glove
compartment
support
frame
.
See513
Interior
Trim
.
3
.
Remove
right
side
footwell
vents
.
4
.
Remove
right
side
control
module
carrier
screws
and
tilt
carrier
down
.
See
Fig
.
46
.
5
.
Remove
expansion
valve
cover
.
See
Fig
.
46
.
Fig
.
46
.
Four
screws
retain
expansion
valve
cover
(arrows)
.
AIR
CONDITIONING
0012666
0012663
6
.
Remove
A/C
refrigerant
line
fiange
bolt(s)
from
expan-
sion
valve
.
Plug
lines
immediately
.
See
Fig
.
47
.
NOTE
-
If
necessary,
remove
air
plenum
grille
fromrear
of
en-
gine
compartment
as
described
earlier
in
Blower
mo-
tor,
removing
and
installing
.
Remove
wiring
hamess
cover
screws
and
then
remove
right
side
plenum
screws
.
Reaching
finto
the
plenum
chamber,
remove
AIC
fine
flange
bolt
to
allow
expansion
valve
room
for
removal
.
Fig
.
47
.
Refrigerant
line
fiange
mounting
boltat
expansion
valve(arrow)
.
7
.
Remove
screws
from
top
of
expansion
valve
and
re-
move
expansion
valve
from
evaporator
.
See
Fig
.
48
.
Fig
.
48
.
Expansion
valve
mountingscrews
(A)
.
0011667
Page 463 of 759
CAUTION
-
Always
replace
O-rings
when
reconnecting
refrig-
erant
fines
.
9
.
Before
recharging,
evacuate
system
for
at
least
30
min
.
Recharge
system
following
equipment
manufacturer's
instructions
.
See
Table
d
.
A/C
System
Refrigerant
Capacities
.
A/C
evaporator,
removing
and
installing
1
.
Followingmanufacturer's
instructions,
connectanap-proved
refrigerant
recovery/recycling/recharging
unit
to
A/C
system
and
discharge
system
.
2
.
Remove
complete
heater
boxas
described
earlier
.
3
.
Remove
expansion
valve
as
described
earlier
.
4
.
Unfasten
evaporator
sensor
electrical
harness
connec-
tor
and
puli
out
sensor
from
ieft
side
of
heater
box
.
See
Fig
.
50
.
Fig
.
49
.
Pull
out
evaporator
sensor
from
housing
in
direction
of
arrow
.
5
.
Remove
rear
heater
box
cover
.
6
.
Remove
clips
retaining
lower
evaporator
housingcover
.
Tilt
outheater
core,
then
pull
evaporator
out
of
housing
.
7
.
Installation
is
reverse
of
removal
.
CAUTION
-
Always
reptace
O-rings
when
reconnecting
refrtg-
erant
fines
.
8
.
Before
recharging,
evacuate
system
for
at
least
30
min
.
Recharge
system
following
equipment
manufacturer's
instructions
.
See
Table
d
.
A/C
System
Refrigerant
Capacities
.
HEATING
AND
AIR
CONDITIONING
640-17
8
.
Installation
is
reverse
of
removal
.
A/C
evaporator
temperature
sensor,
replacing
ou12b46
The
evaporator
temperature
sensor
is
mounted
in
the
left
(driver)
side
of
theheater
box
behind
thecenter
console
.
1
.
Remove
lower
dash
panel
and
knee
boister
on
driver
side
.
See
513
Interior
Trim
.
2
.
Remove
left
footwell
ventilation
duct
byremoving
re-
taining
rivet
in
bottom
of
duct
.
Pull
it
down
and
away
from
heater
box
.
See
Fig
.
50
.
Fig
.
50
.
Left
footwellventilatíon
duct
(arrow)
.
0o1300ba
3
.
Disconnect
sensor
electrical
connector
from
heater
box
.
Pull
sensor
straight
out
of
heater
box
.
Refer
to
Fig
.
49
.
4
.
Installation
is
reverse
of
removal
.
Table
c
.
lists
evapo-
rator
temperature
sensor
test
values
.
Tablec
.
Evaporator
Temperature
Sensor
Test
Values
Test
temp
.
Resistance
23°F
(-5°C)
11
.4
-11
.9
k
ohms
32°F
(0°C)
8
.8
-
9
.2
k
ohms
41
°F
(5°C)
6
.8
-
7
.2
k
ohms
50°F
(10°C)
5
.3-5
.6
k
ohms
59
°
F
(15°C)
4
.2
-4
.5
k
ohms
68°F
(20°C)
3
.3
-
3
.6
k
ohms
77°F
(25°C)
2
.6-2
.9
k
ohms
86°F
(30°C)
2
.1
-
2
.3
k
ohms
95°F
(35°C)
1
.7
-1
.9
k
ohms
AIR
CONDITIONING
Page 464 of 759
640-18
HEATING
AND
AIR
CONDITIONING
A/C
microfilter,
replacing
1
.
Remove
glove
compartment
.
See
513
Interior
Trim
.
2
.
Remove
right
footwell
ventilation
duct
.
See
Fig
.
51
.
0012664
Fig
.
51
.
Unfasten
retaining
rivets
from
right
ventilation
duct
(arrows)
.
3
.
Remove
right
side
control
module
carrier
screws
and
tilt
carrier
down
.
See
Fig
.
52
.
Fig
.
52
.
Control
module
carrier
retaining
screws
(arrows)
.
0012666
4
.
Rotate
A/C
microfilter
housing
release
knob
about45°
counterclockwise
and
remove
filter
housing
cover
.
See
Fig
.
53
.
5
.
Remove
microfilter
while
moving
module
harnesses
out
of
the
way
.
6
.
Installation
is
reverse
of
removal
.
AIR
CONDITIONING
Fig
.
53
.
A/
C
microfilter
cover
release
knob
(arrow)
on
passenger
side
ofheater
box
.
Table
d
.
A/CSystem
Fluid
Capacities
(total)
Fluid
I
Quantity
R-12
refrigerant
1200g
t
25
g
(2
.65
Ibsa
0
.05lbs
.)
R-134a
refrigerant
1000
g
±
25
g
(2
.20
Ibs
.t
0
.05lbs
.)
PAG
oil
SP-10
1200
ml
f
20
ml(R12
system)
(6
.8
oz
.
±
0
.7
oz
.)
Nippondeso120mi
Refrigerant
oil
(R1
34a
system)
I
Seiko
Seiki
150m1
Page 485 of 759
GENERAL
This
section
contains
wiring
diagrams
for
1992
through
1998
BMW
3
Series
models
.
WARNING
-
On
cars
equipped
with
airbags,
special
precautions
apply
to
any
electrical
testing
or
repair
.
The
airbag
unit
is
an
explosive
device
and
must
be
handled
with
exterme
care
.
Before
starting
any
work
onan
airbag
equipped
car,
refer
to
the
warnings
and
cau-
tions
in
720
Seatbelts
and
721
Airbag
Systems
(SRS)
.
NOTE-
The
"
gear
position/neutral
safetyswitch
is
also
some-
timesreferred
to
as
the
automatic
transmission
range
switch
.
"
The
EWS
11
system
is
also
sometimes
referred
to
as
the
Driveaway
Protection
System
or
the
electronic
im-
mobilization
system
.
ELECTRICAL
WIRING
DIAGRAMS
ELE-1
Electrical
Wiring
Diagrams
GENERAL
.
.
.
.
.
.
.
.
.
................
.
.
.
ELE-1
Horns
.....
.
.....
.
.
.
....
.
.
.
.
.
...
.
.
ELE-153
Instrument
Panel
.
.
.
.
.
.
..............
ELE-165
ELECTRICAL
WIRING
DIAGRAMS
...
.
.
.
ELE-2
Interior
Lights/Illumination
.............
ELE-211
ABS
..............
.
.
.
.....
.
.....
ELE-117
Lumbar
Control
.
....................
ELE-247
ABS/AST
.............
.
.
.
...
.
.
.
.....
ELE-120
On-Board
Computer
..................
ELE-173
Airbag
(Supplemental
Restraint
System)
..
ELE-140
Park
Ventilation
.
.
.
...........
.
...
.
..
ELE-139
Air
Conditioning
and
Heating
.
.
.
.
.
.
.....
ELE-129
Power
Distribution
......
.
...
.
.
.
.
.
.
.
...
.
ELE-2
Anti-Theft
(Alpine)
..........
.
.
.
...
.
...
ELE-144
Power
Door
Locks
.
.
......
.
.
.
.
.
.
.
.
.
..
ELE-226
Anti-Theft
(EWS
II)
.
........
.
.
.
...
.
...
ELE-150
Power
Mirrors
...
.
.
.
......
.
.
.
.
.
.
.
.
.
..
ELE-241
Body
Computer
Module
.....
.
.....
.
...
ELE-176
Power
Seats
......
.
......
.
.
.
...
.
.
.
..
ELE-243
Charging
System
.
.
................
.
.
.
ELE-67
Power
Sunroof
.
.
.
.
.
.
.
...............
ELE-248
Convertible
Top
.
.
.
.
................
.
.
ELE-253
Power
Windows
.
.
.
.
.
.
.....
.
.........
ELE-231
Cruise
Control
..
.
.
.
...........
.
....
.
.
ELE-112
Radio/Cassette/CD/Speakers
..........
ELE-255
Data
Link
Connector
................
.
.
.
ELE-86
Rear
Window
Defogger
...............
ELE-160
Engine
Cooling
.......
.
.......
.
....
.
.
.
ELE-94
Shift
Interlock
.
.
.
.
.
.
.
.
...............
ELE-110
Engine
Management
...
.
.......
.
....
.
.
.
ELE-70
Starting
....
.
.
.
.
.
...
.
................
ELE-63
Exterior
Lights
........
.
.
.
.
.
.
.
.
.
......
ELE-194
Transmission
Electronics
.
..............
ELE-96
Ground
Distribution
....
.
.
.
.
.
.
.
.
.
.......
ELE-35
Warning
System
:
Chimes
.............
ELE-178
Headlights/Foglights
...
.
.
.
.
.
.
.
.
.
......
ELE-180
Wiper/Washer
.
.....
.
...............
ELE-155
Heated
Seats
........
.
.
.
.
.
.
.
.
.
......
ELE-245
ELECTRICAL
COMPONENT
LOCATIONS
Relayand
fuse
positions,
ground
locations
...........
.
.
.
.
.
.
.
.
.
................
seeRepair
Group
610
CAUTION-
Always
switchthe
ignition
off
and
disconnect
the
negative
(-)
battery
cablebefore
removing
any
electrical
components
.
"
Prior
to
disconnecting
the
battery,
read
the
bat-tery
disconnection
cautions
given
at
the
front
of
this
manual
on
page
viii
.
"
Connect
and
disconnect
ignition
system
wires,
multiple
connectors
and
ignition
test
equipment
leads
only
while
ignition
is
switched
off
.
-Always
switch
a
test
meter
to
the
appropiate
func-
tion
and
range
before
making
test
connections
.
"
All-Season
Traction
(AST)
is
also
referred
to
as
ASC
or
ASC+T
.
GENERAL
Page 612 of 759
HOTAT
HOTAT
HOTAT
HOT
IN
RUN
HOTAT
HOTINACCY
HOTAT
I
12
BLK/WHT
-
BLK/WHT
ALLTIMES
ALL
TIMES
ALLTIMEB
ORSTART
ALL
TIMES
RUNOR
START
ALL
TIMES
INSTRUMENT
CLUSTER
--~
BS~ELK/GRY
I
I)
BS
VIO/GRN
I
I
)9B
BLK/BLU
I
1
7e
BLK
6
I---1
BLK/BLU
ENGINECONTROL
MODULE
(DME)
r----------,
1
BRN/RED
I
FUNCTION
LIGHT-RECIRCI
)2
I
FUNCTION
-16"
FEAR
DEF06
1
FUNCTION
LIGHT-A/CI
3
BRN/YEL
1
IEAROEFOG61I
5
WHT/GRN
I
PIRCIRCULATIONSWI
6
WHT/RED
I
Al
CSWITCHI
Z
WHT/BLU
B
-
1
~
BEN
G203
TRANSMISSION
CONTROLS
SYSTEM
3
IGNITION[)
GRN/YEL
GRt
NIBLU
LEFTWATERVALVE(
5~YEL/VIOO
INTEGRATED
CLIMATE
REGULATION
CONTROL
MODULE
8848
1
A
STARTERSIGNAL
I
STARTINGSYS
GENERATORSIGNALI
2
CHARGINGSYS
BATTERY
;15
FEWYEL
GROUNOI
16BFNN
GROUND(
17
BRECM(
18V
L
O/GRY
I)1)20
NOMINALTEMPVALVE-RIGHT(
21
YEL/WHTNOMINAL
TEMP
VALVE-LEFTI
22
YEL/BLU
NoMINALAIRFLOW
VALVE
23
YEWBLK
INTERIORTEMPSENSORI
24
YEL
1)25
4~
I
GROUND(
2B
BRN
l----------Ja
Air
Conditioning
&
Heating
1992
(1
of
2)
CONTROLPANEL
I
VE=1=LESPEED
I
~
--
------
-_
r
fiFUBE
FUSEFUSEFUSE
19
31
23
39
15
BA
BA
7
.6A
BA
7
30A
-----------
.~------_
--
22
¢r
nn
ELECTRICAL
WIRING
DIAGRAMS
ELE-129
WATER
VALVE
BE
IFRONT
ROWER
,
I
VIII
JII
(ASSEMBLY
DISTRIBUTION
(
BOX
-
.
MIX
ACTUATOR
Wi
SPNIRED
EVAP
TEMPI
)22
GRY
HEATER
TEMP-LEFT~
24
YELIRED
HEATER
TEMP
R
lG
HT'
26
YEL/SLU
.
MINEmmmmml
"
1)
RED/GRN
19I)6
VENTSOXI
9
GRN}
/BRN
-
~
GRN
GRN
20
1
)10
I
)
11
RIGHTWATERVALVEI
12
YEL/SRN
I
BATTERY
G202
T
INTERIORLIGHTS
SYSTEM
Page 613 of 759
ELE-130
ELECTRICAL
WIRING
DIAGRAMS
HOT
AT
ALL
TIMES
_
BLOWER
r
---
~IIGNITION
BLOWER
MOTOR
I
(SWITCH
BER
SWITCH
BLOWER
RELAY
RESISTORS
I
OFF
START(
OFF
MAXQQ
LOW
L
I
THERMA
ACCRUN
LO
M
HI
LIMITER
L---_--1'J
zl
4
B
1
5"
2
.
234
1
U
r
--
T
Iw
Q
I
[
2
REDIGRN
3
BLKIGRY
4
BLK/BLU
S
GRY
BLK
6
BRNORG
RE
O
GRN
B
-/GR
.
BLK/RED/YEL
AIC
COMPRESSOR
9
BLK/WHTIYEL
10
BRN/RED
11
GRY
12
BLU
13
YEL/RED
M
YE
E
LI
R
BLN
1S
YLIED
18
GRNIBLU
12
YELlV10
18
BRNIYEL
19
FE
./
.FN
2
N
ANXaIARY
FAN
MOTOR
8848
2
TEMPER-
W/O
PARKNEAT
INO
GRN
ATURE
VENTILATION
SWITCH
GRNGRN
D
~1)ABOVE99
W/P~
ARKHEATI
1
2
DEGC
VENTILATION
2)
ABOVE91
3
Y
.Y
2
Y
DEGC
SRN
3
BLU
2
BLKIBLU
J
ml
FRONTPOWER
G202
t
DISTRIBUTION
BOX
Air
Conditioning
&
Heating
1992
(2of2)
:
~
-
11
"
i1111111111
"
1
"
111
"
1
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.
1
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111
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1
1
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11
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1111
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Sri
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YEL
28
FRESHAIR
DASHVENTMIXING
RECIRCULATION
EVAPORATORNORMALSPEED
HIGHSPEED
COMPRESSOR
FLAPMOTOR
FLAPMOTOR
FLAP
MOTOR
TEMPERATURESENSOR
RELAY
RELAY
CONTROLRELAY
ON-BOARD
COMPUTER
r
--------
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I
RE
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I
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FRESH
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LINE
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DATA
LINE
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BRN/V
SWITCH
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PCT
I
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L
--
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INTEGRATED
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1
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PI
14THEATEXCHANGER
TEMPERATURESENSOR
BRNIORG
2
BLU
1
OUTSIDE
TEMPERATURESENSOR
Page 614 of 759
HOTAT
HOTAT
HOTINRUN
HOTATHOTINACCY
HOT-
HOTAT
ALLTIMES
ALL
TIMES
ORSTART
_
ALLTIMES
RUNOR
START
ALLTIMES
ALLTIMES
AUXI
FTFUSE
FUSE
USE
FUSE
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FUSE
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20
23
39
16
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46
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48
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MODULE
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BLK/8LU
TRANSMISSION
CONTROLSSYSTEM
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I
FUNCTION
LIGHT-RECIRC
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RN/RED
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7449
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ELK
VEHICLESPEED,
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INDEPENDENT
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20
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INTEGRATED
CLIMATE
REGULATION
CONTROL
MODULE
IN
a
Air
Conditioning
&
Heating
1993-95
Except
318ti
(1
of
2)
CONTROLPANEL
ELECTRICAL
WIRING
DIAGRAMS
ELE-131
EXCEPT
119953181
19953181
BLKI
Nil
I
WHTIYEL
WATER
VALVE
ASSEMBLY
ELK/
I
RED
15,I
I
,
VARIABLE
CAMSHAFT
CONTROLMODULE
G203INTERIORLIGHTS
SYSTEM
Page 615 of 759
ELE-132
ELECTRICAL
WIRING
DIAGRAMS
2
REDIGRN
3
BLKIGRY
4
BLKIBLU
5
GRY/BLK
B
SRN/ORG
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.
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18
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MOTOR
7449
4
NORMALSPEED
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RELAY
Air
Conditioning
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Heating
1993-95
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RN
5
GRN
6
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Page 616 of 759
BLO
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RELAY
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CONTROLMODULE
HOTATALL
HOTATALL
HOTATALLHOTATALL
HOTINRUNHOTATALL
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Page 617 of 759
ELE-134
ELECTRICAL
WIRING
DIAGRAMS
HOTATALLTIMES
r
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