1994 BMW M3 heater
[x] Cancel search: heaterPage 183 of 759
Table
I
.
ECM
Pin
Assignment-Siemens
DME
MS
41
.1
(continued)
Pin
I
Signal
I
Component/function
1
Signal
FUEL
INJECTION
130-
37
47
-
48
input
Crankshaft
position
sensor
(Hall
effect)
Crankshaft
position
sensor
control
49
input
Power
supply
(terminal
15)
Batteryvoltage
with
key
onor
engine
running
50
output
Solenoid
valve
(running
losses)
Running
losses
51
output
Carbon
canister
valve
Carbon
canister
valve
control
52vacant
-
53
output
Idle
speed
control
valve
Pulsed
ground-close
signal
(seealsopin29)
54
input
Power
supply
Battery
voltagefrom
main
relay
(terminal
87)
55
vacant
-
56
-
57
input
Knock
sensor
(cyl
.
1-3)
Knock
sensor
input
Signal
58
output
Knock
sensor
(cyl
.
1-3)
Knock
sensor
control
59
input
Knock
sensor
(cyl
.
4-6)
Knock
sensor
input
Signal
60
input/output
Diagnostic
connector
(TxD)
Diagnostic
TxD
(transmit)
signal
to
pin
18
in
Data
link
connector
61
output
Oxygen
sensor
heater
(monitoring
sensor)
Oxygen
sensor
heater
ground
62
output
Secondary
air
injection
Secondary
air
injection
control
valve
63
output
Knock
sensor
(cyl
.
4-6)
Knock
sensor
control
64
input
Camshaft
position/rpm
sensor
Camshaft
position/rpm
sensor
control
65
input
Camshaft
position/rpm
sensor
Camshaft
position/rpm
sensor
control
66
-
67
output
Oxygen
sensor
Oxygen
sensor
reference
voltage
68
output
Evaporative
purge
valve
control
Pulsed
ground
with
engine
at
normal
temperature
and
varyingengine
load
69
output
Fuel
pump
relay
control
Fuel
pump
relay
switches
with
engine
runningorcranking
(crankshaft
position
signal
must
be
present
for
relay
switchover)
70
vacant
-
-
71
output
Oxygen
sensor
heater
(regulating
sensor)
Oxygen
sensor
heater
ground
72
output
Oxygen
sensor
(monitoring
sensor)
Oxygen
sensor
referencevoltage
73
input
Main
relay
control
Main
relay
activation
(terminal
85)
74
output
A/C
compressor
control
A/C
compressor
relay
control
75
input
Oxygen
sensor
Oxygen
sensor
signal
76
not
used
-
-
77
input
Oxygen
sensor
(regulating
sensor)
Oxygen
sensor
signal
78
input
Oxygen
sensor
(monitoring
sensor)
Oxygen
sensor
signal
79
output
Oxygen
sensor
(regulating
sensor)
Oxygen
sensor
referencevoltage
80
Traction
control
AST
module
81
Traction
control
AST
module
82
Traction
control
AST
module
83
output
Crankshaft
position
sensor
(Hall
effect)
Crankshaft
position
sensor
control
84
vacant
-
-
85
output
Automatic
transmission
Automatic
transmission
control
module
86
input
Automatic
transmission
Automatic
transmissíon
control
module
87
input
Power
supply
Battery
voltage
from
main
relay
(terminal
87)
88
input/output
Diagnostic
connector
(TxD)
Diagnostic
TxD
(transmit)
signal
to
pin
17
in
Data
link
connector
ECM
PIN
ASSIGNMENTS
Page 185 of 759
160
Fuel
Tank
and
Fuel
Pump
GENERAL
.
.
.
.
.
.
...........
.
....
.
.
.
.
.
.
160-1
Operating
fuel
pump
for
tests
.
.
.
.
.
.
.......
.160-6
Fuel
Pump
Electrical
Tests
.
.
.
.
.
.
.
...
.
.
.
.
.
160-7
FUEL
TANK
AND
LINES
..
.
.
.
..........
160-2
Fuel
pump
electrical
circuit,
testing.
...
.
.
.
.
.
160-7
Fuel
tank,
draining
..
.
.
.
.
.
.
.
.
.
..........
160-2
Fuel
pump
power
consumption,
testing
.
.
.
.
.
.
160-7
Fuel
tank,
removing
and
installing
.........
160-3
Fuel
Delivery
Tests
....
.
.
.
...
.
.....
.
.
.
..
160-8
Fuel
Tank
Evaporative
Control
System
.....
160-4
Relieving
fuel
pressure
and
connecting
fuel
pressure
gauge
..
.
...........
.
.
.
..
160-8
FUEL
LEVEL
SENDERS
.
.
.
.
.
.......
.
.
.
160-4
System
pressure,
testing
.................
160-9
Fuel
level
senders,
testing
.
.
.
.
.
.......
.
.
.
160-5
Fuel
delivery
volume,
testing
.............
160-10
Fuel
leve¡
sender
and
fuel
pump
(right
side),
emoving
and
installing
.
.
.
.
.
.
160-5
TABLES
Fuel
leve¡
sender
(left
side),
a
.
FuelLeve¡
Sender
Resistances
...........
.
.
..
.160-5
removing
and
installing
.........
.
.
.
.
.
.
.
160-6
b
.
Fuel
Pump
Current
...
.................
..
...
160-8
c
.
Fuel
Pressure
Specifications
..............
.
..
160-10
FUEL
PUMP
.
.
.
................
.
.
.
.
.
.
.
160-6
d
.
Fuel
Pump
Delivery
Specifications
.........
.
..
160-10
Fuel
Pump
Fuse
and
Relay
.
.
.
....
.
.
.
.
.
.
.
160-6
GENERAL
This
repair
group
covers
service
information
specifically
for
The
cautions
and
warnings
on
this
page
should
beob
the
fuel
supply
system
.
Information
on
the
fue¡
injection
sys-
served
when
servicing
the
fuel
system
.
tem
is
covered
in
130
Fuel
Injection
.
NOTE-
Fue¡
filter
replacement
is
covered
in
020
Maintenance
Program
.
WARNING
-
"
The
fuel
system
is
designed
to
retain
pressure
even
when
the
ignition
isoff
.
When
working
with
the
fuel
system,
loosen
the
fuel
lines
slowly
toal-
low
residual
fuel
pressure
to
dissipate
gradually
.
Avoid
spraying
fuel
.
"
Before
beginning
any
work
on
the
fuel
system,
place
a
tire
extinguisher
in
the
vicinity
of
the
work
area
.
"
Fuel
is
highly
flammable
.
When
working
around
fuel,
do
not
disconnect
any
wires
that
could
cause
electrical
sparks
.
Do
not
smoke
or
work
near
heaters
or
other
tire
hazards
.
"
Always
unscrew
the
fuel
tank
cap
to
release
pres-
sure
in
the
tank
before
working
on
the
tank
or
fines
.
"
Do
not
use
a
work
light
near
any
fuel
.
Fuel
may
spray
onto
the
hot
bulb
causing
a
tire
.
"
Make
sure
the
work
area
is
properly
ventifated
.
FUEL
TANK
AND
FUEL
PUMP
160-1
CAUTION-
"
Prior
to
disconnecting
the
battery,
read
the
bat-tery
disconnection
cautions
given
at
the
front
of
this
manual
onpage
viü
.
"
Before
making
any
electrical
tests
with
the
ignition
tumed
on,
disable
the
ignition
system
as
de-
scribed
in
120
Ignition
System
.
Be
sure
the
bat-tery
is
disconnected
when
replacing
components
.
"
To
prevent
damage
to
the
ignition
system
or
the
electronic
fuel
system
components,
including
the
control
unit,
aiways
connect
and
disconnect
wires
and
test
equipment
with
the
ignition
off
.
"
Cleanliness
is
essential
when
working
with
the
fuel
system
.
Thoroughly
clean
the
fuel
fine
unionsbefore
disconnecting
any
of
the
fines
.
"
Use
only
clean
tools
.
Keep
removed
parts
clean
and
sealed
or
covered
with
a
clean,
lint-free
cloth,
especially
if
completion
of
the
repair
is
delayed
.
"
Do
not
move
the
car
while
the
fuel
system
is
open
.
"
Avoid
using
high
pressure
compressed
air
to
blow
out
fines
and
componente
.
High
pressure
can
rupture
infernal
seals
and
gaskets
.
"
Always
replace
seals
and
O-rings
.
GENERAL
Page 186 of 759
160-2
FUEL
TANK
AND
FUEL
PUMP
0011943
1
.
Filler
pipe
10
.
Fuel
compensating
siphon
pump
and
hose
assembly
2
.
Filler
pipe
grounding
tab
(models
built
from
1/95)
3
.
Vent
pipe
11
.
Fueltank
4
.
Threaded
collar
12
.
Tank
support
strap
5
.
Rubber
ring
seal
13
.
Bolt-tighten
to
23
Nm
(17
ft-Ib)
6
.
Fuel
pump
14
.
Fuel
expansion
tank
7
.
Left
side
fuel
leve¡
sender(models
built
from
1/95)
15
.
Fuel
tank
pressure
sensor
(OBD
II)
8
.
Right
side
fuel
leve¡
sender9
.
Left
side
fuel
leve¡
sender
with
fuel
compensating
siphon
pump
(models
built
up
to
1/95)
Fig
.
1
.
E36
fuel
tank
assembly
.
FUEL
TANK
AND
LINES
Fuel
tank,
draining
The
plastic
fuel
tank
is
mounted
beneath
the
center
of
the
car
(beneath
rear
seat)
.
Mounted
in
the
fuel
tank
are
the
fuel
pump
and
fuel
leve¡
sending
units
.
Connecting
lines
for
the
evaporative
emission
control
systemand
expansion
tank
are
also
attached
to
the
tank
.
When
performing
the
procedures
that
follow,
refer
toFig
.
1
.
Fuel
tank
capacity
for
E36
modeis
"All
ex
.
1996
M3
(3
.0
L)
.....
.
..
..
65
liters
(17
.0
gal)
"
1996
M3
(3.0L)
modeis
.
...
.
..
.
.62
liters
(16
.4
gal)
FUEL
TA
NKAND
LINES
The
fuel
tank
should
be
drained
into
an
approved
storage
unit
or
another
car's
fuel
tank
.
WARNING
-
"
Before
removing
the
tank,
be
sure
that
afl
hot
components
such
as
the
exhaust
system,
are
completely
cooled
down
.
"
Fuel
may
be
spilled
.
Do
not
smoke
or
worknear
heaters
or
other
Pire
hazards
.
1
.
Disconnect
negative
(-)
cable
from
battery
.
CAUTION-
Prior
to
disconnectiog
the
battery,
read
the
battery
disconnection
cautions
given
at
the
front
of
this
manual
on
paga
vi¡¡
.
Page 187 of 759
2
.
Remove
fuel
tank
filler
cap
.
3
.
Remove
rearseat
cushion
and
pull
back
insulation
mats
to
expose
fuel
tank
access
covers
.
See
Fig
.
2
.
uui3140
Fig
.
2
.
Right
side
fuel
tank
access
cover
under
rear
seat
cushion
.
4
.
Remove
right
and
left
access
covers
to
expose
fuel
hoses
and
electrical
connections
at
tank
.
5
.
Label
fuel
hoses
.
Then
disconnect
hoses
and
harness
connectors
from
fuel
sending
units
and
fuel
pump
.
See
Fig
.
3
.
FUELTANK
AND
FUEL
PUMP
160-
3
NOTE-
"
If
necessary,
push
fuel
level
sender
arm
toward
fuel
pump
assembly
to
facilitate
removal
.
"
BMW
special
tool
no
.
16
1
020
should
beused
tore-
move
and
install
the
threaded
collar
.
Damage
to
thecollar
may
result
if
the
special
tool
is
not
used
.
"
Pump
out
contents
of
each
tanklobe
using
approved
pumpinglextraction
equipment
and
flexible
fuel-grade
hose
.
WARNING
-
Fuel
may
be
spilled
.
Do
not
smoke
or
work
near
heaters
or
other
fire
hazards
.
7
.
Installation
of
sending
units
is
reverse
of
removal,
not-
ing
the
following
:
"
Use
new
sealing
rings
when
installing
pump/sending
unit
assemblies
.
"
Be
sure
that
fuel
line
connections
point
in
same
direc-tion
as
they
carne
out
.
"
Fill
tank
and
check
for
leaks
by
running
engine
.
CA
UTION-
Before
starting
the
engine,
fill
the
fuel
tank
with
at
least
1.5
gallons
(5liters)
of
fuel
.
The
pump
will
be
damaged
if
you
run
it
without
fuel
.
Fuel
tank,
removing
and
installing
1.
Disconnect
negative
(-)cablefrom
battery
:
CAUTION-
Prior
to
disconnectiog
the
battery,
read
the
battery
disconnection
cautions
given
at
the
front
of
this
manual
onpage
viii
.
2
.
Remove
fuel
tank
filler
capand
drain
tank
as
described
earlier
.
3
.
Working
in
left
access
tank
access
hole
(under
rear
seat
cushion),
remove
vent
pipe
fromtank
.
4
.
Working
inside
car,
disconnectparking
brake
cable
ends
from
parking
brake
lever
.
See
340
Brakes
.
5
.
Working
underneath
car,
gently
pry
fuel
lines
away
from
retaining
bracket
in
front
of
tank
.
Remove
clamps
and
disconnect
fuel
hoses
as
shown
in
Fig
.
4
.
6
.
Remove
exhaust
system
and
heat
shield
as
described
ooisiai
in
180
Exhaust
System
.
See
Fig
.
5
.
Fig
.
3
.
Fuel
pump/fuel
level
sender
assembly
in
top
offuel
tank
(right
side
shown)
.
Disconnect
supply
hose
(A),
return
hose
(B)
and
7
.
Remove
driveshaft
.
See
260
Driveshaft
.
harness
connector
(C)
.
8
.
Pull
parking
brake
cables
backward
away
from
bottom
of
6
.
Unscrew
threaded
collars
from
fuel
tank
.
Slowly
with-
fuel
tank,
disengaging
them
from
brackets
as
needed
.
draw
fuel
sender
assemblies
from
tank,allowing
fuel
to
drain
off
.
FUEL
TANKAND
LINES
Page 189 of 759
Fuel
leve¡
senders,
testing
Fuel
leve¡
sender
(right
side)
The
left
and
right
fuelleve¡
sending
units
are
wired
in
series
.
and
fuel
pump,
removing
and
installing
The
fuel
gauge
receives
a
signal
that
is
the
average
of
the
two
1
.
Disconnect
negative
(-)
cable
from
battery
.
input
values
.
1
.
Remove
rear
seat
cushion,
lift
up
insulation
mats,
andremove
both
fuel
tank
access
covers
.
2
.
Disconnect
white
plug
on
each
sending
unit
.
See
Fig
.
6
.
3
.
Check
resistance
value
of
eachsending
unit
.
Values
should
be
the
same
.
5
.
If
valuesare
different,
remove
sending
units
as
described
below,
and
check
resistance
valuésacross
terminals
.
Table
a
lists
resistance
values
for
senders
at
various
float
positions
.
Table
a
.
Fuel
Leve¡
Sender
Resistances
Float
position
Test
result
(ohms)
Right
side
empty
10
ohm
t2
Right
side
full
250
ohm
±
5
Left
side
empty
10
ohm
t
2
Left
side
fui¡
250
ohm
±
5
FUEL
TANK
AND
FUEL
PUMP
160-
5
CAUTION
-
Prior
to
disconnecting
the
battery,
read
the
battery
disconnection
cautionsglven
at
the
front
of
this
manual
onpage
viii
.
2
.
Drain
fuel
from
tank
as
described
earlier
.
WARNING
-
Always
unscrew
the
fuel
tank
cap
to
release
pres-
sure
in
the
tank
before
working
on
the
tank
or
fines
.
3
.
Remove
rear
seat
cushion
and
pull
back
insulation
pad
under
right
side
.
4
.
Remove
screws
holding
rightfuel
tank
accesscover
.
Remove
cover
.
5
.
Label
fuel
hoses
.
Disconnect
hoses
and
harness
con-
nectors
from
fuel
sending
unit
and
fuel
pump
.
6
.
Unscrew
threaded
collar
from
fuel
pumplfuel
leve¡
sender
.
Slowly
withdraw
assembly
from
tank,allowing
fuelto
drain
off
.
See
Fig
.
7
.
0013187
&
0013194
Fig
.
6
.
Fuel
pump/leve¡
sender
terminal
identification
.
Check
resis-
tance
at
terminals
of
white
connectors
(arrows)
.
"
If
necessary,
push
leve¡
sender
arm
toward
fuel
pump
assembly
to
facilitate
removal
.
NOTE
-
BMW
special
tool
no
.
16
1
020
should
beused
to
re-
move
and
install
the
threaded
collar
.
Damage
to
the
collar
may
result
if
the
special
tool
is
not
used
WARNING
-
NOTE-
Fuel
may
be
spilled
.
Do
not
smoke
or
work
near
The
compensating
siphon
pump
(Fig
.
1)
maintains
the
heaters
or
other
fire
hazards
.
fuel
leve¡
between
the
right
and
left
tank
lobes
.
If
the
re-
sistances
are
different
between
the
left
and
right
send-
ers,
remove
the
senders
and
visually
inspect
the
leve)
in
7
.
Using
a
new
sealing
ring,
install
pump
and
sending
each
lobe
.
If
the
leve¡
is
different,
check
the
siphon
com-
unit,
being
sure
that
fuel
line
connections
point
in
same
pensating
pump
.
direction
as
they
carne
out
.
8
.
Reconnect
harnessconnector
and
hoses
.
Fill
tank
and
check
for
leaks
by
running
engine
.
Insta¡¡
access
cover
and
its
mountingscrews
.
Reconnect
negative
(-)
cable
to
battery
.
CAUTION
-
Before
starting
the
engine,
fill
the
fuel
tank
with
at
least
1
.5
gallons
(5liters)
of
fuel
.
The
pump
will
be
damaged
if
you
run
it
without
fuel
.
FUEL
LEVEL
SENDERS
Page 192 of 759
160-
8
FUEL
TANK
AND
FUEL
PUMP
UU131
tst5
Fig
.
11
.
Voltage
supply
to
fuel
pump
harness
(black)
connector
being
checked
(arrow)
.
00131ts7
Fig
.
12
.
Test
fuel
pump
for
current
draw
by
attadhing
ammeter
andjumper
wire
as
shown
.
CAUTION-
Do
not
allow
the
test
leads
to
short
to
ground
.
NOTE-
See
600
Electrical
System-General
for
information
on
electricaltests
using
a
digital
multimeter
(DMM)
.
4
.
Run
pump
as
described
in
Operating
fuel
pump
for
tests
.
FUEL
PUMP
5
.
Compare
ammeter
reading
with
specification
listed
in
Table
b
.
Maximum
current
5
.0
amps
consumption
FuelDelivery
Tests
Table
b
.
Fuel
Pump
Current
Checking
fuel
delivery
is
a
fundamental
part
of
trouble-
shooting
and
diagnosing
the
DME
system
.
Fuelpressure
di-
rectly
influences
fuel
delivery
.
An
accurate
fuel
pressure
gauge
will
be
needed
to
make
the
tests
.
There
arethree
significant
fuel
delivery
values
to
bemea-
sured
:
"
System
pressure-created
by
the
fuel
pump
and
main-
tained
by
the
pressure
regulator
.
"
Fuel
delivery
volume-created
by
the
fuel
pump
and
af-
fected
by
restrictions,
suchas
clogged
fuel
filter
.
"
Residual
pressure-the
pressure
maintained
in
the
closed
system
after
the
engine
and
fuel
pump
areshut
off
.
Procedures
for
measuring
the
first
two
quantities
arede-
scribed
here
.
Residual
fuel
pressure
is
checked
using
the
procedurede-
tailed
in
130
Fuel
Injection
.
Relieving
fuel
pressure
and
connecting
fuel
pressure
gauge
WARNING
-
"
Gasoline
is
highly
flammable
and
its
vaporsare
explosive
.
Do
not
smoke
or
work
ona
car
near
heaters
or
other
fire
hazards
when
diagnosing
and
repairing
fuel
system
problems
.
Have
a
fire
extinguisher
available
in
case
of
an
emergency
.
"
When
working
onan
open
fuel
system,
wear
suit-
able
hand
protection
.
Prolonged
contact
with
fuel
can
cause
iflnesses
and
skin
disorders
.
CA
UTION-
Cleanliness
is
essential
when
working
withfuel
circuit
components
.
Thoroughly
clean
the
unionsbefore
disconnecting
fuel
fines
To
prevent
fuel
from
spraying
on
a
hotengine,
system
fuel
pressure
should
be
relieved
before
disconnecting
fuel
lines
.
One
method
is
to
tightly
wrap
a
shop
towel
around
a
fuel
line
fit-
ting
and
loosen
or
disconnect
the
fitting
.
Measuring
fuel
pressure
requires
special
tools
.
Earlier
cars
use
pressure
hose
with
clamps
for
fuel
delivery
.
These
can
be
attached
to
a
fuel
pressure
gauge
below
the
intake
manifold
.
Page 195 of 759
170
Radiator
and
Cooling
System
GENERAL
.
.
.....
.
...
.
.
.
.
.
....
.
.
.
.
.
.
.
.170-1
Coolant
Pump
and
Thermostat
........
.
.
.
.
170-1
Radiator
and
Expansion
Tank
.........
.
...
170-1
Cooling
Fans
.
....
.
.
.
.
.
.
.
.
.
.....
.
......
170-2
Warnings
and
Cautions
.
.
.
.
.
.
.
.
.
.
.
.
...
.
.
.
170-2
TROUBLESHOOTING
...
.
.
.
...
.
.
.
.
.
.
.
.
.170-2
Cooling
System
Pressure
Test
...
.
.
.
.
.
.
.
.
.
170-3
Thermostat
Quick
Check
.
.
.
.
...
.
.
.
.
.
.
.
.
.
170-3
Temperature
Gauge
Quick
Check
.
.
.
.
.
.
.
.
.
170-3
Cooling
fan,
testing
.
.
.
.
........
.
.
.
.
.
.
.
.
.
170-4
COOLING
SYSTEM
SERVICE
.
.
.
.
.
.
.
.
.
.
170-5
Coolant,draining
and
filling
.
.
......
.
.
.
.
.
..
170-5
Cooling
system,
bleeding
(radiator
with
integral
expansion
tank)
.....
170-6
GENERAL
This
section
covers
repair
and
troubleshooting
information
for
the
engine
cooling
system
.
For
heater
core
and
related
heating
and
air
conditioning
components,
see640
Heating
and
Air
Conditioning
.
Coolant
Pump
and
Thermostat
A
centrifuga¡-type
coolant
pump
is
mounted
to
the
front
of
the
engíne
.
The
belt-driven
pump
circulates
coolant
through
the
system
whenever
the
engíne
is
running
.
A
thermostat
con-
trols
the
flow
of
coolant
into
the
radiator
.
When
the
engíne
is
cold
the
thermostat
is
closed
so
coolant
bypasses
the
radiator,
recirculating
from
the
engíne
directly
back
to
the
pump
.
When
the
engíne
reaches
operating
tem-
perature,
the
thermostat
opens
and
coolant
circulates
through
the
whole
system
including
the
radiator
.
Radiator
and
Expansion
Tank
The
radiator
is
a
crossflow
design
.
A
translucent
expansion
tank
provides
for
coolant
expansion
at
higher
temperatures
and
easy
monitoringof
the
coolant
leve¡
.
On
4-cylinder
modeis,
the
radiator
expansion
tank
is
integral
with
the
radiator
.
See
Fig
.
1
.
RADIATOR
AND
COOLING
SYSTEM
170-1
Belt-driven
cooling
fan,
replacing
.
.......
.
.
.
170-7
Electric
cooling
fan,
replacing
.
.
.
.....
.
.
.
.
.
170-8
Auxiliary
cooling
fan,
replacing
.
.
.....
.
.
.
.
.
170-8
Thermostat,
replacing
.
.
.
.
.
.
.
.
.
.....
.
.
.
.
.
170-9
Coolant
pump,
replacing
..........
.
.
.
.
.
.
170-10
RADIATOR
SERVICE
.....
.
......
.
.
.
.
.
.
170-11
Radiator,
removing
and
installing
....
.
.
.
.
.
.
170-11
TABLES
a
.
Coolant
Temperature
Sensor
Wire
Colors
...
.
..
.
.
170-3b
.
Auxiliary
Cooling
Fan
Switching
Temperatures
.:.
.170-4
c
.
Auxiliary
Cooling
Fan
Temperature
Switch
Tests
..
..
.
...
...
.
.............
.
..
.
.
170-5d
.
Cooling
System
Capacities
..............
..
.
.
.
170-6
A
.
Expansion
tank
C
.
Dualtemperature
fan
switch
B
.
Radiator
drain
screw
Fig
.
1
.
Radiator
assembly
with
integral
expansion
tank
(4-cylinder
engine)
.
On
6-cylinder
models,
a
standalone
expansion
tank
is
used
.
On
cars
with
automatic
transmission,
ATF
is
circulated
through
an
additional
heat
exchanger
(ATF
cooler)
.
GENERAL
Page 200 of 759
170-6
RADIATOR
AND
COOLING
SYSTEM
Fig
.
6
.
Radiator
drain
plug
(arrow)
.
WARNING
-
Coolant
is
poisonous
.
Itis
especially
lethal
to
pets
.
Cleanup
spills
immediately
and
rinse
the
area
with
water
.
NOTE
-
The
block
drain
plug
is
located
on
the
exhaust
side
of
the
engine,
near
the
reas
of
the
engine
.
4
.
Reinstall
radiator
and
engine
block
drain
plugsusing
new
sealing
washers
.
Leave
heater
controis
on
full
warm
.
5
.
Using
a
coolantmixture
of
50%
antifreeze
and
50%
dis-
tilled
water,
fill
system
slowly
On
radiator
with
integral
expansion
tank,
bleed
cooling
system
as
described
be-
low
.
NOTE-
"
Tap
water
may
cause
corrosion
of
radiator,
engine
and
coolant
hoses
.
"
Coolant
can
often
be
reused
provided
itis
clean
and
less
than
twoyears
old
.
Do
not
reuse
coolant
when
re-
placing
damaged
engine
parts
.
Contaminated
coolant
may
damage
the
engine
or
cooling
system
.
Tabled
.
Cooling
System
Capacities
Engine
j
Capacity
4-cylinder
1
6
.5
liters
(6.9
qt)
6-cylinder
M50/M52
10
liters
(10
.6
qt)
S50US/S52US
10
.5
liters
(11
.1
qt)
COOLING
SYSTEM
SERVICE
Tightehing
Torques
"
Radiator
drain
plug
to
radiator
...
2-3
Nm
(18-27
in-lb)
"
Engine
block
drain
plug
to
block
.
.
..
25
Nm
(18
ft-Ib)
Cooling
system,
bleeding
(radiator
with
integral
expansion
tank)
NOTE
-
On
radiators
with
a
separate
expansion
tank,
ableed
screw
is
not
provided
.
The
cooling
system
with
sepa-
rate
expansion
tank
is
self
bleeding
via
the
vent
hose
on
the
expansion
tank
.
Air
maybecome
trapped
in
the
system
during
filling
.
Trapped
air
can
prevent
proper
coolant
circulation
.
Whenever
the
coolant
is
drained
and
filled,
the
system
should
be
bled
of
trapped
air
.
1
.
With
engine
cold,
add
coolant
to
expansion
tank
until
level
reaches
COLD
(KALT)
mark
on
tank
.
2
.
Loosen
bleed
screw
on
radiator
expansion
tank
.
See
Fig
.
7
.
0011976
Fig
.
7
.
Cooling
system
bleed
screwon
radiator
(arrow)
.
Note
cold
level
mark
on
expansion
tank
.
3
.
M3
models
:
Loosen
bleed
screw
on
thermostathous-
ing
.
4
.
Set
temperature
controls
in
passenger
compartment
to
fui¡
warm
and
turn
ignition
on
position
(do
not
start
en-
gine)
.