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
