air conditioning BMW 318i 1998 E36 Owner's Manual
[x] Cancel search | Manufacturer: BMW, Model Year: 1998, Model line: 318i, Model: BMW 318i 1998 E36Pages: 759
Page 383 of 759
NOTE
-
Sometimes
the
color
of
en
installed
wire
may
be
differ-
ent
than
the
one
on
the
wiring
diagram
.
Don't
be
con-
cerned
.
Just
be
sure
lo
confirm
that
the
wire
connects
lo
the
proper
terminals
.
Wire
color
codes
"
BLU
.........
.
..
..
...
.
.................
Blue
"
BRN
....:....
.
..
..
...
..
...............
Brown
"
YEL
.........
.
..
..
...................
.Yellow
"
GRN
.........
.
..
..
...
.
................
creen
"
G
RY
.......
.
.
.
..
..
.....................
G
ray
"
ORG
.........
.
..
..
...
.
..............
.Orange
"
RED
......
...
.
.
..
.....................
.Red
"
BLK
.........
.
..
..
...
.
................
Black
"
VIO
..........
.
..
...
..
..
.......
.
.......
Violet
"
WHT
.........
.
.
....
.
...
:..............
White
Table
a
.
Terminal
and
Circuit
Numbers
Number
1
Circuít
description
1
j
Low
voltage
switched
terminal
of
coi¡
4
1
High
voltage
center
termina¡
of
coi¡
+x
Originates
atignition
switch
.
Supplies
powerwhen
the
ignition
switch
is
in
the
PARK,
RUN,
or
START
position
15
Originates
atignition
switch
.
Supplies
powerwhen
ignition
switch
is
in
RUN
or
START
position
30
Battery
positive
(+)
voltage
.
Supplies
power
whenever
battery
is
connected
.
(Not
dependent
on
ignition
switch
position,
unfused)
31
1
Ground,
battery
negative
(-)
terminal
50
Supplies
power
from
battery
to
starter
solenoid
when
ignition
switch
isin
START
position
only
+54
Originates
atignition
switch
.
Supplies
power
when
ignition
switch
isin
the
RUN
position
only
85
1
Ground
side
(-)
ofrelay
coil
86
1
Power-in
side
(+)
ofrelay
coil
87
1
Relay
actuatedcontact
D
Alternator
warning
light
and
field
energizing
circuit
ELECTRICAL
SYSTEM-GENERAL
600-
3
Additional
abbreviations
shown
in
the
wiring
diagrams
are
given
below
.
Abbreviations
"
ABS
........
.
...
.
...
.
..........
antilock
brakes
"
A/C
........
.
...
..
..
.
.........
.airconditioning
"
AST/ASC+T
.......
...
.
.
.......
al¡
season
traction
"
CONV
.......
.
.
...
.................
convertible
"
DME
........
.
.
...
.......
digital
motor
electronics
"
ECM
.......
.
...
..
..
.
..
electronic
control
module
"
EWS/EWS
II
......
...
.
.
coded
driveaway
protection
"
SRS
........
.
supplemental
restraint
system-airbag
"
TCM
........
.
..
....
.
transmission
control
module
"
ZKE
(94-98
models)
..
..
.
...
central
body
electronics
"
ZVM
(92-93
models)
...
.
.
..
.
.......
central
locking
ELECTRICAL
TROUBLESHOOTING
Most
terminals
are
identified
by
numbers
on
the
compo-
nents
and
harness
connectors
.
The
terminal
numbers
for
ma-
Four
things
are
required
for
current
toflow
in
any
electrical
jor
electrical
connections
are
shown
in
the
diagrams
.
Though
circuit
:
a
voltagesource,
wires
or
connections
to
transport
the
many
terminal
numbers
appear
only
once,
severa¡other
num-
voltage,
a
load
or
device
that
uses
the
electricity,
and
a
con-
bers
appear
in
numerous
places
throughout
the
electrical
sys-
nection
to
ground
.
Most
problemscanbefound
using
a
digital
tem
and
identify
certain
types
ofcircuits
.
Some
of
the
most
multimeter
(volt/ohm/amp
meter)to
check
for
voltage
supply,
common
circuit
numbers
are
listed
below
in
Table
a
.
for
breaks
in
the
wiring
(infinite
resistance/no
continuity),
orfor
a
path
to
ground
that
completesthe
circuit
.
Electric
current
is
logical
in
its
flow,
always
moving
from
the
voltage
sourcetoward
ground
.
Electricalfaults
can
usually
be
located
through
a
process
of
elimination
.
When
troubleshoot-
ing
a
complex
circuit,
separate
the
circuit
into
smaller
parts
.
The
general
testsoutlined
below
may
be
helpful
in
finding
electrical
problems
.
The
information
is
most
helpful
when
used
with
the
wiring
diagrams
.
Be
sure
to
analyze
the
problem
.
Use
the
wiring
diagrams
to
determine
the
most
likely
cause
.
Getan
understanding
of
how
the
circuit
works
by
following
the
circuit
from
groundback
to
the
power
source
.
When
making
test
connections
at
connectors
andcompo-
nents,
use
care
to
avoidspreading
or
damaging
the
connec-
tors
or
terminals
.
Some
tests
may
require
jumper
wires
to
bypass
components
or
connections
in
the
wiring
harness
.
When
connecting
jumper
wires,
use
bladeconnectors
at
the
wire
ends
that
match
the
size
of
the
terminal
being
tested
.
The
small
interna¡
contacts
are
easily
spread
apart,
and
this
can
cause
intermittent
or
faultyconnections
that
can
leadto
more
problems
.
ELECTRICAL
TROUBLESHOOTING
Page 447 of 759
GENERAL
E36
cars
are
equipped
with
integrated
automatic
heating
and
air
conditioning
systems
.
Many
of
the
procedures
given
in
this
repair
group
require
that
the
A/C
refrigerant
charge
be
evacuated
using
specialized
equipment
.
See
A/C
System
Warningsand
Cautions
later
in
this
repair
group
.
HEATER
AND
CONTROLS
Blower
motor,
removing
and
installing
NOTE-
On
6-cylinder
cars,
the
plastic
top
enginecover
and
fuel
rail
covermustbe
removed
.
The
fuel
injectorhamess
re-
taining
screws
must
be
removed
and
the
harness
set
aside
.
The
engine
control
module
(ECM)
cover
must
be
removed,
the
control
unit
connectors
unplugged
and
the
harness
pulled
out
of
the
way
.
See
130
Fuel
Injection
.
1
.
Disconnect
negative
(-)
cable
from
battery
.
2
.
Open
hood
.
Unclip
engine
bulkhead
plenum
grille
at
base
of
windshíeld
and
remove
grille
.
See
Fig
.
1
.
HEATING
AND
AIR
CONDITIONING
640-1
640
Heating
and
Air
Conditioning
GENERAL
.
...
.
....
.
.
.
.
.
.
.
.
.
.......
.
.
.
640-1
Heater
andA/C
air
distribution
motor,
replacing(rotary-knob)
.
.
...
.
.
.
.......
.
640-10
HEATER
AND
CONTROLS
.
.....
.
.
.
.
.
.
.640-1
Rear
Window
Defogger
.
.
.
.
.
.
.
.
.
.
...
.
.
.
640-10
Blower
motor,
removing
and
installing
.
.
.
.
.
.
640-1
Rear
Window
Blower
(convertible
models)
.
.640-10
Blowermotor
resistor
pack,
replacing
.
.
.
.
.
.
640-3
AIR
CONDITIONING
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
640-11
Heater
valve,
replacing
...........
.
.
.
.
.
.
.
640-3
Heater
box,
removing
and
installing
.
.
.
.
.
.
.
.
640-4
A/CSystem
Warnings
and
Cautions
.
.
.
.
.
.
:640-11
Heater
core,
replacing
.....
.
.
:
....
.
.
.
.
.
.
.
640-6
A/C
compressor,
replacing
.
.
::.
:
:
.
.
.
.
.
.
.
.640-12
Heater
core
temperature
sensor,
replacing
.
.
640-7
A/C
Compressor
Clutch
.
.
.
.
.
.
.
:
.
.
.
.
.
.
.
.
.
640-13
Heater
andA/C
Control
Head
.
.
....
.
.....
.
640-7
A/C
condenser,
replacing
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
640-14
Heater
andA/C
control
head,
removing
A/C
receiver/drier,
replacing
.
.
.
.
.
.
.
.
.
.
.
.
.
640-15
and
installing
(rotary-knob)
.
.
....
.
......
640-7
A/C
expansion
valve,
Heater
andA/C
control
head,
removing
removing
and
installing
...
.
.....
.
.
.
.
.
.
.
640-16
and
installing
(digital-display)
.
.....
.
.....
640-8
A/C
evaporator,
removing
and
installing
.
.
..
640-17
Heater
andA/C
control
module,removing
A/C
evaporator
temperature
sensor,
and
installing
(rotary-knob)
.
.
...
.
.
.
.
.
.
.
.
640-8
replacing
.
.
.
.
.
.
..............
.
.
.
.
.
..
640-17
Heater
andA/C
control
module,removing
A/C
microfilter,
replacing
......
.
....
.
.
.
..
640-18
and
installing
(digital-display)
.
...
.
.
.
.
.
...
640-8
Sensor
fan
for
interior
temperature,
TABLES
replacing
.
.
.
....
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
640-9
a
.
Blower
Motor
Test
Values
.........
...
.
.
......
640-3
Heater
andA/C
AirDistribution
Motors
.
.
.
.
.
.
640-9
b
.
Heater
Core
Temperature
Sensor
Test
Values
...
.640-7
c
.
Evaporative
Temperature
Sensor
Test
Values
...
640-17
d
.
A/C
System
Fluid
Capacities
(total)
..
..........
640-18
0012527
Fig
.
1
.
Detach
grille
retaining
clips
(arrows)
and
pull
grille
upward
and
out
of
rubbergasket
.
CAUTION-
Prior
to
disconnectiog
the
battery,
read
the
battery
disconnection
cautionsgiven
at
the
front
of
this
manual
onpage
viii
.
HEATER
AND
CONTROLS
Page 448 of 759
640-2
HEATING
AND
AIR
CONDITIONING
3
.
Remove
wiring
harness
retaining
clip
at
bulkhead
.
Re-
move
screws
retaining
wiring
harness
cover
and
pull
cover
forward
.
See
Fig
.
2
.
0012529
Fig
.
2
.
Ming
harness
cover
screws
at
base
ofwindshield
(arrows)
.
4
.
On
passenger
side,
push
aside
wiring
harness
and
re-
move
two
screws
retaining
plenum
housing
.
See
Fig
.
3
.
Fig
.
3
.
Ríghtside
plenum
retaining
screws
(arrows)
.
VU1L535
5
.
On
driverside,
push
aside
wiring
harness
and
remove
screw
retaining
plenum
.
Pull
plenum
up
and
remove
from
engine
bay
.
See
Fig
.
4
.
6
.
Unclip
blower
motor
housing
cover,
disconnect
control
cable,
and
turn
center
retainer
1
/4
turn
to
remove
cover
.
See
Fig
.
5
.
7
.
Disconnect
electrical
connectors
from
blower
motor
.
8
.
Remove
left
upper
section
of
blower
housingby
detach-
ing
spring
clipsat
edge
of
housing
.
See
Fig
.
6
.
HEATER
AND
CONTROLS
Fig
.
4
.
Remove
screw
at
A
and
pull
air
plenumupward
.
0012534
0012636
Fig
.
5
.
Blower
motor
housing
clips
(A)
;
control
cable
(B)
;
and
center
retainer(C)
.
i
[u6,
Fig
.
6
.
Spring
clips
(arrows)
on
driver
sideof
blower
housing
.
Page 449 of 759
9
.
Release
blower
motor
retaining
strap
andremove
blow-
er
motor
and
fans
fromcowl
opening
.
NOTE-
Twist
and
rotate
blowermotor
assembly
to
facilítate
re-
moval
from
opening
.
If
the
blower
motor
is
to
be
rein-stafled,
use
care
not
to
damage
fan
wheels
during
removal
.
ff
the
blower
motor
fs
to
be
replaced,
cut
offfan
wheels
at
center
to
aid
in
removal
.
10
.
Installation
is
reverse
of
removal
.
When
installing
a
re-
placement
blower
motor,
instan
motor
into
cowlarea
before
installing
fan
wheels
.
Blower
motor
test
specifi-
cations
are
listed
in
Table
a
.
NOTE
-
On
replacementblowermotors
from
BMW,
thefan
wheels
come
unattached
to
aid
in
installation
.
Locatearrow
on
blower
motor
and
instan
fan
wheels
atthis
po-
sition
.
Be
sure
color
coolng
matches
.
Retain
fan
wheels
using
the
new
clips
.
See
an
authorized
BMW
parts
de-
partment
for
the
latest
parts
information
.
Table
a
.
Blower
Motor
Test
Values
Testingvoltage
13
VDC
Operating
voltage
9-15
VDC
Max
.
current
consumption
(approx
.)
12
amps
Maximum
speed
3,600-4,000rpm
Axialplay
(max
.
allowable)
1
.0
mm
(0
.04
in
.)
Blower
motor
resistor
pack,
replacing
The
blower
resistor
pack
is
clipped
into
the
upper
left
side
of
theheater
box
.
1
.
Remove
lower
left
dash
trim
panel
.
See513
Interior
Trim
.
2
.
Working
under
left
(driver's)
side
of
dash,
unclip
and
pulí
out
resistor
pack
from
sideof
heater
box
.
Remove
harness
connector
from
resistor
pack
.
See
Fig
.
7
.
3
.
Installation
is
reverse
of
removal
.
Heater
valve,
replacing
The
two-way
heater
valve
is
located
in
the
rear
of
the
engine
compartment
on
the
driver
side
.
The
solenoid
operated
valves
control
the
coolant
flow
through
the
dual-chamber
heater
core
.
1
.
Drain
engine
coolant
.
See
170
Radiator
and
Cooling
System
.
HEATING
AND
AIR
CONDITIONING
640-
3
uuiGO4I
Fig
.
7
.
Blower
fan
resistor
pack
(black
arrow)
and
resistor
pack
re-
ceptacle
(white
arrow)
below
left
sideof
dash
.
WARNING
-
Allow
the
cooling
system
to
cool
before
opening
ordraining
the
cooling
system
.
2
.
Disconnect
hoses
and
harness
connector
at
heater
valve
.
See
Fig
.
8
.
001[ó38b
Fig
.
S
.
Hoses
(A)
and
harnessconnector
(B)
at
heatervalve
.
3
.
Carefully
pull
heater
valve
out
of
rubber
mounting
and
pull
up
and
out
of
engine
compartment
.
4
.
Installation
is
reverse
of
removal
.
Use
new
hose
clamps
.
Inspect
hoses
and
replace
asnecessary
.
HEATER
AND
CONTROLS
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 451 of 759
Fig
.
12
.
Mounting
bolt
for
A/C
refrigerant
line
flange
(arrow)
.
001Suu7
Fig
.
13
.
A/
C
control
module
(A)
behind
center
console
.
Arrows
pointto
electrical
harness
connectors
to
be
disconnected
.
CAUTION
-
Replace
heater
and
AIC
flange
O-rings
and
tight-
en
fasteners
to
specified
torques
.
0012644
HEATING
AND
AIR
CONDITIONING
640-5
Fig
.
14
.
Heating
and
ventilation
ducts
on
left
side
of
heater
box
(arrows)
.
Right
side
ducts
are
similar
.
Fig
.
15
.
Heater
box
retaining
bracket
in
center
console
(arrow)
.
0012645
10
.
Unclip
andremove
heating
and
ventilation
ducts
on
Tightening
Torques
sides
of
heater
box
.
See
Fig
.
14
.
"
A/C
refrigerant
lines
flange
to
bulkhead
..............
.
..
..
.
3
.5
Nm
(31
in-lb)
11
.
Remove
heater
box
retaining
bracket
on
center
tunnel
"
Water
hose
flange
to
bulkhead
and
remove
heater
box
.
See
Fig
.
15
.
(M6
nut)
................
.
...
..
3
.5
Nm
(31
in-lb)
"
Heater
box
retaining
bracket
12
.
Installation
is
reverse
of
removal
.
Evacuate
and
re-
to
tunnel
................
.
..
..
.
4
.5
Nm
(40
in-lb)
charge
A/C
system
using
specialized
equipment
.
Fill
and
bleed
cooling
system
.
See
170
Radiator
and
Cooling
System
.
HEATER
AND
CONTROLS
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 454 of 759
640-8
HEATING
AND
AIR
CONDITIONING
0012649
Fig
.
22
.
A/
C
control
head
faceplate
screwson
rotary
knob
version
(ar-
rows)
.
Once
screws
are
removed,
faceplate
must
be
un-
clipped
from
control
head
.
Fig
.
23
.
Push
control
panel
out
ofcenter
console
.
4
.
Remove
harness
connectors
.
Unfasten
heater
duct
control
flex-shaft
on
right
side
of
control
head
by
squeezing
retaining
tab
.
PA
shaftout
of
coupling
in
control
head
and
remove
head
.
5
.
Installation
is
reverseof
removal
.
HEATER
AND
CONTROLS
0012650
Heater
and
A/C
control
head,
removing
and
installing(digital-display)
1
.
Remove
Multi-Information
Display
(MID)
module
from
center
of
dash
.
See
620
Instruments
.
2
.
Reach
into
dash
through
MID
opening
and
push
A/C
control
head
outwards
.
3
.
Disconnect
harness
connector
and
remove
control
head
.
4
.
Installation
is
reverse
of
removal
Heater
andA/C
control
module,
removing
and
installing
(rotary-knob)
1
.
Remove
Multi-Information
Display
(MID)
module
from
center
of
dash
.
See
620
Instruments
.
2
.
Remove
center
console
.
See
513
Interior
Trim
.
3
.
Disconnect
wiring
harness
connectors
to
A/C
control
module
in
center
console
and
removemodule
.
See
Fig
.
24
.
0013007
Fig
.
24
.
A/
C
control
module
(A)
in
center
console
.
Arrows
point
to
electrical
harness
connectors
at
A/Cmodule
.
Heater
and
A/C
control
module,
removing
and
installing(digital-display)
TheA/C
control
module
for
cars
with
the
digital
display
is
mounted
on
the
back
of
the
control
head
.
See
Fig
.
25
.
1
.
Remove
control
head
as
described
earlier
and
place
onan
anti-static
mat
.
Page 455 of 759
Sensor
fan
Fig
.
25
.
Digital
display
A/C
control
head
components
.
2
.
Unscrew
left
and
right
screws
retaining
control
head
to
control
module
.
Press
retaining
clips
and
release
front
plate
from
control
head
.
Remove
A/C
control
module
from
control
head
housing
.
Sensor
fan
for
interior
temperature,
repiacing
A
small
electricfan,installed
in
the
A/C
control
head,
draws
cabin
air
past
the
climate
control
temperature
sensor
.
1.
Remove
A/C
control
head
as
described
earlier
.
2
.
Rotary-knob
control
head
:
Disconnect
electrical
con-
nector
from
top
of
control
head
housing
.
Pry
open
plas-
tic
housing
and
remove
sensor
fan
.
See
Fig
.
26
.
0013181
Fig
.
26
.
Sensor
fan
(A)
and
harness
(B)
in
back
of
A/C
control
head
(rotary-knob
control
head
shown)
.
3
.
Digital
display
models
:
Disconnect
electrical
harness
connector
from
control
head
housing
.
Remove
screws
holding
sensor
fan
to
bottom
of
control
moduleand
re-
move
.
Refer
to
Fig
.
25
.
4
.
Installation
is
reverse
of
removal
.
HEATING
AND
AIR
CONDITIONING
640-
9
Heater
and
A/C
Air
Distribution
Motors
The
recirculation,
fresh
air
and
othervent-duct
flaps
are
controlled
electrically
via
a
series
of
air
distribution
actuating
motors
.
Cars
with
the
rotary-knob
control
head
use
three
elec-
tromechanical
motors,
each
held
in
place
via
a
small
plastic
clip
.
See
Fig
.
27
.
Rightside
of
heater
box
l
Fig
.
27
.
Location
of
early
production
air
distribution
motors
(arrows)
.
Later
systems
(with
the
digital
display
control
head)
use
five
distribution
motors,
four
of
which
are
digítally
controlled
.
See
Fig
.
28
.
HEATER
AND
CONTROLS