coolant sensor BMW 318i 1992 E36 Service Manual
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 452 of 759
640-6
HEATING
AND
AIRCONDITIONING
Heater
core,replacing
1.
Drain
engíne
coolant
.
See170
Radiator
and
Cooling
System
.
WARNING
-
Allow
the
cooling
system
to
cool
before
opening
or
drainíng
the
cooling
system
.
2
.
Remove
center
console
.
See
513
Interior
Trim
.
3
.
Remove
Multi-Information
Display
(MID)
module
.
See
620
Instruments
.
4
.
Remove
lower
dash
panel
and
knee
bolster
on
driver
side
.
See
513
Interior
Trim
.
Fig
.
17
.
Wire
harness
retaining
clips
and
wire
ties
at
heater
box
cover
5
.
Working
under
driver
side
of
dash,
remove
coolant
(arrows)
.
flange
from
heater
core
.
See
Fig
.
16
.
0012651
Fig
.
16
.
Bolts
at
3-way
coolant
flange
under
driver's
side
of
dash
(ar-
rows)
.
NOTE-
Residual
coolant
in
heater
core
will
spill
.
Protect
thecarpet
.
6
.
Working
at
front
of
driveshaft
tunnel,
unclip
wire
har-
nesses
and
move
to
one
side
in
front
of
heater
box
.
See
Fig
.
17
.
7
.
Remove
heatercore
temperature
sensorsas
described
later
in
this
repair
group
.
8
.
Remove
front
heater
box
cover
.
See
Fig
.
18
.
9
.
On
right
side
of
heater
box,
unclip
heater
air
duct
actu-
ating
lever
.
Remove
cross-rod
(with
flaps)
from
frontof
heater
core
.
See
Fig
.
19
.
HEATER
AND
CONTROLS
0012662
Fig
.
18
.
Screws
retaining
front
heater
box
cover
(shown
removed)
to
heater
box
(arrows)
.
0012661
Fig
.
19
.
Pry
heater
flap
actuating
lever
in
direction
A
.
Pull
offair
flap
cross-rod
in
direction
B
.
Page 453 of 759
10
.
Pul¡
heater
core
up
and
backward,
away
from
heater
box
.
If
necessary,
remove
left
and
right
reinforcing
bracket
bolts
.
See
Fig
.
20
.
CAUTION-
Replace
coolant
flange
O-rings
and
tighten
fas-
teners
to
specified
torques
.
Tightening
Torques
1
.
Remove
center
console
.
See
513
Interior
trim
.
0012660
Fig
.
20
.
PA
heater
core
upand
towardback
of
car
.
Lower
mounting
bolts
for
steering
column
brace
and
glove
compartment
sup-
port
frame
may
have
to
be
removed
(arrows)
.
11
.
Installation
is
reverse
of
removal
.
Fill
and
bleed
cooling
system
.
See
170
Radiator
and
Cooling
System
.
"
Coolant
flange
to
heater
core
.
..
....
3
Nm
(27
in-lb)
Heater
andA/C
Control
Head
Heatercore
temperature
sensor,
replacing
The
automatic
heating
and
air
conditioning
systemuses
severa¡
sensors
to
control
interior
air
temperature
.
Use
the
fol-
lowing
procedure
and
the
data
in
Table
b
to
pinpoint
problems
with
theheater
core
sensors
.
2
.
Remove
Multi-Information
Display
(MID)
module
.
See
6201nstruments
.
HEATING
AND
AIR
CONDITIONING
640-7
0012648
Fig
.
21
.
Remove
heatercore
temperaturesensors
in
direction
shown
(arrow)
.
Table
b
.
Heater
CoreTemperatureSensor
Test
Values
Test
temperature
Resistance
4°F
(-20°C)
84
.39
-
109
.61
k
ohms
14
°
F
(-10°C)
48
.58
-
62
.09
k
ohms
32°F
(0°C)
28
.89
-
36
.40
k
ohms
68°F
(20°C)
11
.13
-
13
.83
k
ohms
140°F
(60°C)
2
.19
-
2
.78
k
ohms
212°F
(100°C)
0
.58
-
0
.77
k
ohms
Two
types
of
heater
and
aír
conditioning
control
heads
viere
installed
in
E36
cars
.
Early
models
have
control
heads
with
four
rotary
knobs
and
a
separate
control
module
.
A
flexible
shaft,
clipped
to
the
right
sideof
the
control
head,
controls
the
heater
flaps
.
Later
model
E36
cars,
starting
in
approximately
mid-1995,
have
digital
display
control
heads
with
buttons
.
The
A/C
con-
trol
module
is
integrated
with
the
digital
control
head
.
Heater
and
A/C
control
head,
removing
and
installing
(rotary-knob)
3
.
Pul¡
temperature
sensors
from
heater
box
and
discon-
1
.
Remove
Multi-Information
Display
(MID)
module
from
nect
harness
connectors
.
See
Fig
.
21
.
center
of
dash
.
See
620
Instruments
.
4
.
Installation
is
reverse
of
removal
.
2
.
Pul¡
off
outer
rotary
knobs
from
A/C
control
head
.
Re-
move
two
screwsonknob
bezels
.
Remove
control
pan-
el
face
plate
by
prying
it
off
control
head
gently
.
See
Fig
.
22
.
3
.
Carefully
push
control
head
back
into
dash
and
down-
ward
through
MID
opening
.
See
Fig
.
23
.
HEATER
AND
CONTROLS
Page 534 of 759
ELE-50
ELECTRICAL
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Page 555 of 759
8727
4
FRONT
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ELECTRICAL
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ELE-71
Engine
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19921
.8L
(2
of
2)
INTEGRATED
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Page 557 of 759
8727
6
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Page 559 of 759
8727
8
GR
FUEL
PUMP
FRONT
POWER
DISTRIBUTION
BOX
-
-
-
-
-
-
----
-
-
-
-
-
-
I
H
OTIN
OXYGENSENSOR
RELAY
I
HEATEDOXYOEN
I
RUNAND
SENSOR
VII
O
I
k
I
FUSE
I
F18
I
1sA
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31811~
"
BLK
20
ENGINESPEED
--\
INPUT
WHTIBLK
21
FUEL
GIN/VIO
I
mI
QGRN
VIO
BRNGRNRED
WHT
ml
flED/WHTflED/WHT
LT
6117
I
DRY
~~
W1EGS
I
W/EGS
L
IENGINDICATOR
BLK
BLK
.
ELK
74
7
ELK
16
ICRANKRPHI
ICAMPOSSENS
ELK
VEL
44
I
CAMPOS
SENS
WH7/BLK
_
WHT/BLK
17I
FUELCONSSIG
68
87
2Y
GRN
Engine
Management
1993-951
.8L
(2
of
2)
a
ELECTRICAL
WIRING
DIAGRAMS
ELE-75
I
ELK
,
ICRANKSENS
YEL67i
ICRANKSENS
B
R
N/
ORG
28
,I
SHEILO
GROUND
_____SRN
36
I;
EEVALVECTRL
WHT/YEL
2B,
L
ISCVALVECTRL
,ED/W
.I
199531811
m
819930NLY
INTEGRATED
CLIMATE
CRANKSHAFT
CAMSHAFT
REGULATION
POSITION/RPM
POSITION
CON7ROLM000LE
SENSOR
SENSOR
I
~~BRNIBL
gRNIBLCA
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CLUSTER
SYSTEM
11995,
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1
J
.
1
.l
2A,
A,
I,
i
l
_
I
I
I
I
L__i
EL
LT
VAPORATIVE
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RESONANCE
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EDR
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CVLl-2
CYL3-4
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VALVEVALVE
CHANGEOVER
SWITCH
KNOCKKNOCK
TEMPERATURE
VALVE
9930NLY)
(1
9
953
1
BlI811
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SENSOR
SENSOR
81
ANTI-
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GR
~
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I
BATTERY
BRNN/BU
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5
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-
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THROTTLE
POSITION
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Page 561 of 759
87200
ml
1
G312
GRN/VI
O
BRN/GRN
RED
RED
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--
FRONT
POWER
DISTRIBUTION
BOX
I
OXYGENSENSORRELAY
I
~
RED/WHT
RED/WHT
/I\
RED/WHT
W/OEGS
Engine
Management
1993-95
2
.5L
(2
of
2)
ELECTRICAL
WIRING
DIAGRAMS
ELE-77
HEATEDOXVGEN
CRANKSHAFT
CYL1-3
CYL4-6
SENSOR
POSITION(
KNOCK
KNOCK
-
RPM
SENSOR
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W/
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I
I
I
INSTRUMENT
WHT/BLKCLUSTER
ELK
I
/
BLKK/B~SVBITEM
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64
I
B
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AIC
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WHT/BLK
46
I
BRNIORG
11
IFUELCONS
BRN/GRV
37
I7
VALVEPOS
BLK
47
I
IGN
TIMING
WHT/VIO
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W
ITXDDATA
HT/VEL87
H
IR%DDATA
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U^
WT/VIO
vc
I
WHT/VEL
0
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AIR
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nFffi
BRNIORG
26
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BLK
40
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______
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Page 563 of 759
GRN/VIO
HOT
IN
RUNAND
START
HOT
FILM
AIR
HALLEFFECT
CRANKSHAFT
ELCTRONIC
r
-1FRONT
MASSMETER
CAMSHAFTSENSOR
POSITION/RPM
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I
(POWER
r
-
-
1
1
1
SENSOR
MODULE
(EWS11)
FUSE
I
FSSE
F
IDIS7RIBUTION
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ISA
(BOX
I
I
(199fi)
(1997)
I
is
Y
iBy
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I
D
-
22
OXYGENSENSOR
(BEHIND
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88648
FUEL
PUMP
SPLICE
BLK
-----
.--_
.-------
OXYGENSENSOR
(FRONT
OFCATALYTIC
CONVERTER)
Engine
Management
1996-971
.91-(2
of
2)
EVAPORATIVE
IDLESPEED
EMISSION
CONTROL
VALVEVALVE
ELECTRICAL
WIRING
DIAGRAMS
ELE-79
EXCEPT
1997
318
ti
INSTRUMENT
CLUSTER
SYSTEM
EXCEPT
31811
INTAKEAIR
I
CYL1-2
CYL3-4
RESONANCE
INTAKEAIR
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-
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CHECK
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I
WHT/BLK
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I
FUEL
X
t
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CONSUMPTION
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FUEL
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74,
r
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Page 565 of 759
SO
OXYGEN
OXYGEN
OXYGEN
OXYGEN
CAMSHAFT
DUALTEMPERATURE
SECONDAIR
PUMP
RELAY
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ID
SECOND
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UST
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TEMPERATURE)
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VALVEVALVEVALVE
SENSOR
68894
(1997
ONLY)
ELECTRICAL
WIRING
DIAGRAMS
ELE-81
Engine
Management
1996-97
2
.81L
(2
of
2)
II
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