1998 BMW M3 radiator

170-10



RADIATOR
AND
COOLING
SYSTEM

Coolant
pump,
replacing

The
engine
coolant
pump
is
mounted
in
the
frontof
the
en-

gine
on
the
timing
cover
.
See
Fig
.
16
.

Fig
.
16
.
Coolant
pump
mounted
on
timing
cover
.

NOTE-

Onlyreplacement
coolant
pumps
with
metal
¡mpellers
should
be
installed
.
Pumps
with
plastic
impellers
should
not
be
used
.

1.
Drain
cooling
system
as
described
earlier
.

0013197

WARNING
-

Allow
cool¡ng
system
to
cool
before
open¡ngor
drain¡ng
system
.

2
.
Remove
primary
cooling
fan
shroud
and
cooling
fan
(belt-driven
or
electric)
as
described
earlier
.

Fig
.
17
.
Engine
drive
belt
tensioner
being
released
on
M44
engine
.
Pry
off
tensioner
cover
and
then
lever
tensioner
in
counterciock-
wise
direction
(as
facing
engine)
and
slip
belt
off
pulleys
.

Fig
.
18
.
Drive
belt
tensioner
being
released
on
M52
engine
.
Pry
off
3
.
Disconnect
hoses
from
thermostat
housing
.
Unbolt



tensioner
cover
and
then
lever
tensioner
clockwise
(as
facing
thermostat
housing
from
front
of
cylinder
head
.



engine)torelease
belt
tension
.

4
.
Remove
coolant
pump
drive
belt
.
See
Fig
.
17
or
Fig
.
18
.

NOTE-

-
Mark
direction
of
drive
belt
rotation
if
reusing
belt
.



"
The
6-cylinder
coolant
pump
¡s
mounted
on
studs
and
retained
by
nuts
.
"
Severa¡
drive
belt
and
tensioner
configurations
havebeenused
in
E36
models
.
Refer
to
020
Maintenance
Program
and
640
Heating
and
Air
Conditioning
.

5
.
Remove
coolant
pump
pulley
from
pump
.

6
.
Remove
mounting
fasteners
from
pump
.

COOLING
SYSTEM
SERVICE

NOTE-

"
The
4-cylinder
coolant
pump
¡s
mounted
us¡ng
two
dif-
terent
length
bolts
.
Note
where
thelonger
bolt
fits
dur-
ing
disassembly
.

0011989

7
.
Insert
twoscrews
(M6)
in
tapped
bores
and
tighten
uni-
formly
until
pump
is
free
from
timing
chain
cover
.
See
Fig
.
19
.

Fig
.
19
.
Coolant
pump
being
removed
.
Thread
two
M6
bolts
(arrows)
in
evenly
to
withdraw
pump
.
(Thermostat
and
hoseshavebeen
removed
tor
visual
access
.)

8
.
Installation
is
reverse
of
removal
.

"
Be
sure
to
replace
O-ring
and
gaskets
.

"
Coat
O-ring
with
lubricant
during
installation
.

Tightening
Torque

"
Coolant
pump
to
timing
chaincover

M6
...
.
...................
..
.
.
10
Nm
(89
in-lb)

M8
.
..
.
....................
.
.
.
22
Nm
(17
ft-Ib)

"
Coolant
pump
pulley

to
coolant
pump
.................
10
Nm
(89
in-lb)

RADIATOR
SERVICE

Radiator,
removing
and
installing

1
.
Drain
radiator
as
described
earlier
.

WARNING
-

Allow
cooling
system
to
cool
before
opening
ordraining
system
.

2
.
Remove
primary
cooling
fan
(belt-driven
or
electric)
as

described
earlier
.

3
.
Disconnect
coolingfan
and
leve¡
sensor
harness
con-

nectors
from
bottom
of
radiator,
where
applicable

4
.
Disconnect
harness
connector
from
auxiliary
fandual

temperature
switch
.
See
Fig
.
20
.

5
.
Disconnect
all
coolant
hoses
from
radiator
.

RADIATOR
AND
COOLING
SYSTEM



170-11

0012500

Fig
.
20
.
Cooling
fan
dual
temperatura
switch
(arrow)
on
right
sido
of
radiator
.

6
.
Where
applicable,
disconnectautomatic
transmission
fluid
(ATF)
cooler
lines
from
radiator
.
See
Fig
.
21
.

Fig
.
21
.
Automatic
transmission
fluid
(ATF)
linos
at
radiator
.

7
.
Carefully
pryout
radiator
retaining
clips
from
top
of
ra-

diator
.
See
Fig
.
22
.

8
.
Pul¡
radiator
up
and
out
of
car
.

NOTE-

The
radiator
rests
ontwo
rubber
mounts
.
Check
that

the
mounts
do
not
stick
to
the
bottomof
the
radiator
.

RADIATOR
SERVICE

170-12



RADIATOR
AND
COOLING
SYSTEM

Fig
.
22
.
Radiator
retaining
clip
being
removed
.
Push
down
and
pulí
screwdriver
forward
to
release
clip
.

9
.
Installation
is
reverse
of
removal
.

"
Fill
radiator
and
cooling
system
as
described
under
Coolant,
draining
and
filling
.
"
Check
ATF
leve¡
and,
if
necessary,
top
up
.
See
240
Au-
tomatic
Transmission
.

RADIATORSERVICE

410-4



FENDERS,
ENGINE
HOOD

4
.
With
aid
of
assistant,
remove
hood
hinge
bolts
from
left

and
Rght
sides
of
hood
.
Lift
hood
off
carefully
See
Fig
.
8
.

Fig
.
8
.



Hood
hinge
bolts
(arrows)
.
Right
side
shown
.

5
.
Installation
is
reverse
of
removal
.

NOTE-

The
hood
was
fitted
and
attached
to
an
unfinished
body
at
the
factory
.
Unfinished
surfaces
exposed
by
this
pro-
cedure
must
betouchedup
wfth
pafnt
.

Hood,
aligning

ENGINE
HOOD

0013149

6013150

Fig
.
9
.



Hood
panel
gaps
should
be
even
(approx
.
5
.5
mm)
at
all
points
(arrows)
.

Hood
release
cable
and
latches,
adjusting

Before
adjusting
hood
latches,
be
sure
the
hood
is
aligned

evenly
to
fenders
and
front
panel
.
The
hood
latch
and
cable

assembly
is
shown
in
Fig
.
10
.

"
Repair
any
paint
damage
and
paint
any
exposed
metal
.

"
Check
hood
alignment
as
described
next
.



1
.
To
adjust
hood
cables
:

When
installing
the
hood,
align
the
hinges
as
close
to
the
original
paintedsurface
as
possible
.
Movement
of
the
hood
on
its'attaching
hardware
may
require
touch-up
paint
.

The
hood
should
be
aligned
so
that
gapson
all
sides
areas

even
as
possible
.
See
Fig
.
9
.

Clearance
Specification

"
Hood
edges
to
adjoining
body

panel
(gap)
........
..
..
..
.....
.5
.5
mm
(0.216
in)

"
Remove
left
and
right
radiator
grilles
.
See
510
Exterior

Trim,
Bumpers
.

"
Remove
electric
auxíliary
cooling
fan
.
See
170
Radia-

tor
and
Cooling
System
.

"
Adjust
cable
section
between
two
hood
latches
so

there
is
no
play
(cables
must
not
be
under
tension
ei-

ther)
.

2
.
Loosen
hood
latches
at
hood
on
left
and
right
sides
.

Loosen
bolts
only
enough
to
allow
movement
of
latch
.

See
Fig
.
11
.

3
.
Lower
(but
do
not
fully
latch)
hood
severa¡
times
so

latches
on
hood
center
themselves
in
lower
locks
.

CA
UTION-

Do
not
let
hood
fockwith
latchbolts
loose
.

4
.
Tighten
hood
latch
bolts
when
alignment
is
correct
.

5
.
Remove
one
screw
fromeach
side,
clean
and
coat
with
Loctite
O
270
or
equivalent,
and
reinstall
.

GENERAL
.
.
.
.
.
.
.
.
.
...
.
..
.
...
.
.........
510-1



Front
bumper
impact
absorber,
replacing
....
510-4

Rear
bumper,
removing
and
installing



.....
.510-4

OUTSIDE
REAR
VIEW
MIRRORS
.
...
.
.....
510-1



Rear
bumper
impact
absorber,
replacing
...
.
510-6
Outside
mirrorglass,
replacing



.
.
.........
510-1



Bumper
height,
adjusting



...
.
...
.
...
.
.
.
.
.
510-6
Outside
mirror
housing,
removing
and
installing
....
.
.....
.
.
.
.
.
.
510-1



EXTERIOR
TRIM



...
.
.
.
.
.
.
.
.
.
.
.
...
.
.
.
.
.
510-6
Outside
mirror,
removing
and
installing
.
.
.
.
.
510-2



BMW
embiem,
removing
and
installing
.
.
.
.
.
.
510-7

Body
side
molding,
replacing



.
.
.
.
.
.
.
.
.
.
.
.
.
510-7
BUMPERS



.
.
.
.
.
....
.
.....
.
.....
.
.
.
.
.
.
510-3



Radiator
grille,
removing
and
installing
.
.
.
.
.
.510-7
Front
bumper,
removing
and
installing
.
.
.
.
.
.
510-3



Front
panel,
removing
and
installing
...
.
.
.
.
.
510-7

GENERAL

510
Exterior
Trim,
Bumpers

This
repair
group
includes
repair
information
for
the
outside

rear
view
mirror,
front
and
rear
bumpers,
and
the
easily
re-

movable
exterior
trim
parts
.

OUTSIDE
REAR
VIEW
MIRRORS

The
remove
controlled
mirrors
come
in
two
styles
:
heated
and
unheated
.
Many
of
the
mirror
components
are
separately

available
from
an
authorized
BMW
dealer,
including
the
glass

and
outside
plastic
housing
.

Outside
mirror
glass,
replacing

CAUTION-

Mirror
shouldbe
ator
above
room
temperature
before
removal
.
Otherwise,
small
plastic
parts
or
glass
will
break
.

1
.
Insert
thin
pry
tool
(wooden
or
tape-wrapped
screwdriv-

er)
between
bottom
mirror
edge
and
mirror
housing
and

carefully
pry
out
mirror
glass
from
housing
.
See
Fig
.
1
.

2
.
Heated
mirror
:
remove
heating
element
harness
con-

nectors
from
back
of
mirror
glass
.

3
.
Install
new
glass
into
position
by
pressing
firmly
until
it

snaps
into
place
.

EXTERIOR
TRIM,
BUMPERS



510-1

00130
..

Fig
.1
.
Prying
mirror
glass
out
of
mirror
housing
.
Note
screwdriver
shaft
wrapped
with
tape
.

Outside
mirror
housing,

removing
and
installing

1
.
Remove
mirror
glass
as
described
above
.

2
.
Remove
housing
retaining
screws
and
lift
off
rear
hous-
ing
.
See
Fig
.
2
.

3
.
Tilt
mirror
housing
forward
and
compress
plastic
retain-

ers
and
lift
off
front
housing
.
See
Fig
.
3
.

4
.
Installation
is
reverse
of
removal
.
Check
mirror
function

before
installing
covering
parts
.

OUTSIDE
REAR
VIEW
MIRRORS

BMW
emblem,
removing
and
installing

The
procedure
given
below
applies
to
both
front
and
rear

emblems
.

1
.
Wrap
and
of
a
screwdriver
with
tape
.

CAUTION-

Protect
hood
paint
by
coveringarea
aroundem-

blem
with
tape
.

2
.
Carefully
pryout
emblem
.
See
Fig
.
15
.

UVI1'¿.

Fig
.
15
.
BMW
emblem
being
removed
.
Pry
up
emblem
carefully
on
ei-

ther
side
(arrows)
.
Note
tape
on
screwdriver
tips
.

3
.
Installation
is
reverse
of
removal
.

"
Replace
plastic
inserts
in
body
if
damaged
.

"
If
emblem
fits
loosely
intoinserts,
use
a
small
amount

of
bodymoldingtape
or
adhesiva
on
rear
of
emblem

before
installing
.

Body
side
molding,
replacing

To
remove
body
side
moldings,
carefully
pry
the
moldings

straight
off
.
See
Fig
.
16
.

Installation
is
the
reverse
of
removal
.
Replace
any
clips
or

clip
covering
boots
damaged
during
removal
.

Radiator
grille,
removing
and
installing

1
.
Remove
plastic
front
radiator
shroud
or
air
duct,
as

needed

2
.
Lightly
tap
center
of
grilla
toward
radiator
andremove

from
panel
opening
.
Chrome
ring
pulís
out
from
front
.

See
Fig
.
17
.

3
.
To
replace,
snap
grille
andchrome
piece
together
.

Push
assembly
into
front
panel,
pressing
at
top
and

bottom
until
it
snaps
into
place
.

EXTERIOR
TRIM,
BUMPERS



510-7

Fig
.
16
.
Body
sida
molding
retainingclips
(arrows)
.

-



0013048

Fig
.
17
.
Radiator
grille
being
tapped
inward
.
Right
side
front
panel
top

retaining
screw
is
shown
at
A
.

Front
panel,
removing
and
installing

The
front
panel
is
shown
in
Fig
.
18
.

1
.
Remove
front
bumper
as
described
earlier
.

2
.
Remove
headlights
.
See
630
Exterior
Lighting
.

3
.
Remove
radiator
grille
as
described
earlier
.

4
.
With
engine
hood
open,
remove
front
panel
retaining

screws
at
left
and
right
sides
of
radiator
.
See
Fig
.
19
.

EXTERIOR
TRIM

510-
8



EXTERIOR
TRIM,
BUMPERS

Fig
.
18
.
Front
panel
assembly
.
Note
top
retaining
screws
(A),
retaining
screws
at
radiator
support
(B),
and
side
retaining
screws
(C)
.

00130~,
u
Fig
.
19
.
Front
panel
retaining
screws
at
radiator
(arrows)
.
Right
side
shown
.
To
remove
left
side
screws
it
may
be
necessary
tore-
move
airfilter
housing
or
duct
.

5
.
Remove
front
paneltop
retaining
screws
near
hood
latches
.
Refer
to
Fig
.
17
.

6
.
Working
under
car,
remove
left
and
right
side
panel
re-
taining
screws
.
See
Fig
.
20
.

7
.
Remove
panel
and
repair
orreplace
with
painted
part
.

8
.
Installation
is
reverseof
removal
.

EXTERIOR
TRIM

0013145
Fig
.
20
.
Front
bumper
mustbe
off
to
access
far
right
and
left
front
panel
retaining
screws
from
below
(arrows)
.
(Right
side
shown
.)

600
Electrical
System-General

GENERAL
.
...........
.
.
.
.
.
.
.
.
.
...
.
...
600-1

Voltage
and
Polarity
........
.
.
.
.
.
.
.
.....
600-1

Ming,
Fuses
and
Relays
............
.
.
.
.
600-1

Electrical
System
Safety
Precautions
...
.
.
.
.
600-1

Electrical
Test
Equipment
.....
.
.
.
....
.
.
.
.
600-2

WIRING
DIAGRAMS
..
.
.
.
.
.
.
.
.
.
........
600-2

Ming
Codes
and
Abbreviations
..
.
...
.
....
600-2

ELECTRICAL
TROUBLESHOOTING
..
.
..
600-3

Voltage
and
Voltage
Drops
..........
.
.
.
.
.
600-4

GENERAL



Electrical
System
Safety
Precautions

A
brief
description
of
the
principal
parts
of
the
electrical
sys-
tem
is
presented
here
.
Also
covered
here
are
basic
electrical
system
troubleshooting
tips
.

Voltage
and
Polarity

The
vehicle
electrical
system
is
a
12-volt
direct
current
(DC)
negative-ground
system
.
A
voltage
regulator
controls
system
voltage
at
approximately
the
12-volt
rating
of
the
battery
.
Al¡
circuits
are
grounded
by
direct
or
indirect
connection
to
the

negative
(-)
terminal
of
the
battery
.
A
number
of
ground
con-

nections
throughout
the
car
connect
the
wiring
harness
to

chassis
ground
.
These
circuits
are
completedby
the
battery

cable
or
ground
strap
between
the
body
and
the
battery
nega-

tive
(-)
terminal
.

Wiring,
Fuses
and
Relays

Nearly
all
parts
of
the
wiring
harnessconnect
to
compo-

nents
of
the
electrical
system
with
keyed,
push-on
connectors

that
lock
into
place
.
Notable
exceptions
arethe
heavy
battery

cables
and
the
starter
wiring
.
The
wiring
is
color-coded
for
cir-

cuitidentification
.

With
theexception
of
the
battery
charging
system,
most

electrical
power
is
routed
from
the
ignition
switch
or
the
bat-
tery
through
the
main
fuse/relay
panel,
located
in
¡he
left
rear

comer
of
the
engine
compartment
.
Fuses
are
color
coded
to

indicate
current
capacities
.

The
relays
and
control
units/modules
are
mounted
in
vari-

ous
places
throughout
the
vehicle
.
See610
Electrical
Com-

ponent
Locations
.

ELECTRICAL
SYSTEM-GENERAL
600-1

Voltage,
measuring
.
.
.
................
.
.
600-4

Voltage
drop,
testing
.
.
.....
.
.....
.
......
600-4

Continuity,
checking
..
.
...
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
600-5
Short
Circuits
.
.
.
.
.
.
.
.
.....
.
...
.
.
.
.
.
.
.
.
.
600-5

Short
circuit,
testing
with
ohmmete'r
.
.
.
.
.
.
.
.
.
600-6

Short
circuit,
testing
with
voitmeter
.
.
.
.
.
.
.
.
.
600-6

TABLES
a
.
Terminal
and
Circuit
Numbers
..............
..
.600-3
Please
read
the
following
warnings
and
cautions
before
do-
ing
any
work
on
your
electrical
system
.

WARNING
-

"
The
cars
covered
by
this
manual
are
equipped
with
aSupplemental
Restraint
System
(SRS)
that
automatically
deploys
one
or
more
airbags
.
Each
airbag
unit
houses
an
explosive
powerful
charge
.
Any
work
involving
the
SRS
system
should
only
be
performed
byan
authorized
BMW
dealer
.
Making
repairs
without
the
proper
knowledge
and
special
test
equipment
may
cause
serious
per-
sonal
injury
.
See
721
Airbag
System
(SRS)
.

"
The
ignition
system
of
the
car
operates
at
lethal
voltages
.
People
with
pacemakers
or
weak
hearts
should
not
expose
themselves
to
the
ignition
sys-
tem
.
Extra
caution
mustbe
taken
when
working
on
the
ignition
system
or
when
servicing
theen-
gine
while
it
is
runningor
the
key
is
on
.
See
120
Ignition
System
for
additional
ignition
system
warnings
and
cautions
.

"
Before
operating
the
starter
without
starting
the
engine
(as
when
making
a
compressfon
test),
dis-
able
the
ignition
system
as
described
in
120
Igni-
tion
System
.

"
Keep
hands,
clothing
and
other
objects
clear
of
the
electric
radiator
coollng
fan
when
working
on
a
warm
engine
.
The
fan
may
start
at
any
tíme,
even
when
the
ignition
is
switched
off
.

GENERAL