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)
.
5
.
Slowly
add
coolant
until
it
spills
from
bleed
screws
.
When
coolant
spillíng
from
bleed
screws
is
free
of
air
bubbies,
tighten
screws
.
6
.
Run
engine
until
it
reaches
operatíng
temperature
.
Af-
ter
engine
has
cooled,
recheck
coolant
level
and
top
up
as
necessary
.
CAUTION-
Always
use
genuine
BMW
coolant
or
its
equiva-
lent
to
avoid
the
formation
of
harmful,
clogging
de-
posits
in
the
cooling
system
.
Use
of
other
antifreeze
solutions
may
be
harmful
to
the
cooling
system
.
Tightening
Torque
"
Radiator
bleed
screw
to
thermostat
housing
...
.
.
........
8
Nm
(71
in-lb)
Belt-driven
cooling
fan,
replacing
1
.
Usinga32
mm
wrench
on
fan
clutch
nut,
turn
wrench
quickly
in
a
clockwise
direction
(working
from
front
of
car)
to
loosen
.
Spin
fan
off
pump
.
See
Fig
.
8
.
NOTE-
"
The
radiator
cooling
fan
nut(32
mm
wrench)
has
left-
hand
threads
.
"
The
nut
may
be
difficult
to
loosen
.
Use
a
tool
to
hold
the
coolant
pump
pulleystationary
.
BMW
hasa
spe-
cial
tool
forthis
purpose
(BMW
special
tool
no
.
115
030)
.
2
.
Remove
expansion
rivets
holding
shroud
to
radiator
.
See
Fig
.
9
.
Remove
fan
and
shroud
together
.
NOTE-
Store
the
removed
fan
clutch
assembly
in
an
upright
(installed)
positionto
prevent
lossof
clutch
fluid
.
RADIATOR
AND
COOLING
SYSTEM
170-
7
Fig
.
8
.
Radiatorcooling
fannut
(arrow)
.
Nuthas
left-hand
threads
.
3
.
To
replace
fan
clutch,
remove
fan
mounting
bolts
and
separate
clutch
from
fan
.
Fig
.
9
.
Fan
shroud
retaining
rivet
(arrow)
.
Pryout
center
pin
and
re
4
.
Installation
is
reverse
of
rernoval
.
move
rivet
.
Rivet
design
may
vary
depending
on
model
and
model
year
.
Tightening
Torques
"
Clutchnut
to
coolant
pump
(left-hand
threads)
Wíthout
BMW
tool
no
.
11
5
040
.....
40
Nm
(29
ft-lb)
With
BMW
tool
no
.
11
5
040
.
......
30
Nm
(22
ft-Ib)
"
Fan
to
viscous
clutch
...
.
..
.
......
10
Nm
(89
in-lb)
0013203
COOLING
SYSTEM
SERVICE
