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
.
