Buick LeSabre 1965 Service Manual page 820

ACCESSORIES
OPTIONAL HEATER-AIR CONDITIONER SYSTEM 1 1 - 8 7
and opening the drum shut-off
valve to pour refrigerant through
the unit. The unit should be sup-
ported so that the refrigerant
passing through it will be directed
into an area where a temperature
of -21.7 °F. will do no damage.
When a unit is not removed such
as a condenser, disconnect the
inlet and outlet lines before flush-
ing it out.
CAUTION: When liquid refriger-
ant is poured from the drum into
an area where atmospheric pres-
sure exists, its temperature will
immediately drop to -21.7 °F.
In order to keep the expansion
valve open when flushing the
evaporator with refrigerant, the
expansion valve bulb must be de-
tached from the evaporator outlet
tube.
In all cases where it is necessary
to flush the air conditioner sys-
tem, the receiver-dehydrator
should be replaced. Also, the ex-
pansion valve inlet screen should
be cleaned.
Dry nitrogen which is much less
expensive than refrigerant, is
preferred, if available, for flush-
ing out the air conditioner system.
Nitrogen will not cause the tem-
perature to drop as refrigerant-
12 does. The cold temperatures
make it difficult to remove the
contaminated oil from the unit
being flushed. Also, the dry nitro-
gen will remove moisture from
the sytem.
I. Removal of Evaporator
Assembly and Air
Distribution Parts
Figures 11-94 and 11-95 show
the installation of the evaporator
assembly and a i r distribution
system on the 45000, 46000 and
48000 Series.
Figures 11-96 and 11-97 show the
installation of the 49000 Series
evaporator and air distribution
system.
To remove the evaporator assem-
bly on the 49000, remove the
brackets that retain assembly to
instrument panel. Then disconnect
assembly from distribution duct
and right outer outlet, and lower
assembly down from under in-
strument panel. Complete re-
moval by disconnecting lines from
evaporator assembly.
When reinstalling assembly be
sure to properly install drain
hoses and use new "O" rings on
refrigerant lines. See Figure
11-97.
To remove distribution duct to
service heater core on 49000,
lower evaporator assembly from
instrument panel. Then discon-
nect distribution duct, and re-
move from right s i d e of
instrument panel.
1 1 - 1 6 COMPRESSOR
CLUTCH, COIL AND
SHAFT SEAL
REMOVAL AND
INSTALLATION
It is not necessary to remove
compressor from refrigeration
system to service clutch parts.
It may be necessary to loosen it
on its mounting to remove clutch
pulley.
CAUTION: N e v e r stand com-
pressor on pulley end.
a. Clutch Drive
Plate Removal
1. Hold the clutch drive plate hub
with J-9403 wrench and use
J-9399 special thin wall 9/16"
socket to remove shaft nut. See
Figure 11-98.
2. Screw threaded Hub Puller
J-9401 into the drive plate hub.
Hold body of tool with a wrench
and tighten the center screw to
remove clutch drive plate. See
Figure 11-99.
3. Remove clutch hub key from
compressor shaft or from clutch
drive plate hub.
4. Remove clutch drive plate as-
sembly retainer ring, using
J-5403 No. 21 Truarc Pliers. See
Figure 11-100. Remove spacer
from inside hub of clutch drive
plate.
b. Clutch Drive
Plate Installation
1. Insert clutch hub key into hub
of clutch drive plate so it pro-
jects approximately 3/16" out of
end of keyway. See Figure 11-101.
2. Line up key in hub with keyway
and position clutch drive plate on
shaft.
3. P l a c e Spacer J-9480-2 on
Clutch Drive Plate Installer
J-9480-1 and thread installer on
end of compressor shaft. See
Figure 11-102. Press the clutch
drive plate on shaft until there is
approximately 3/32" space be-
tween the friction faces of the
drive plate and pulley as shown
in Figure 11-102.
4. Remove installer and insert
spacer inside clutch drive plate
hub.
5. Install clutch drive plate re-
tainer ring with flat side of ring
facing spacer, using J-5403, No.
21 Truarc Pliers.
6. Install a new shaft nut, using
J-9399, special thin wall 9/16"
s o c k e t . Tighten to 15 lb. ft.
torque. The air gap between the
friction faces of the pulley and
clutch drive plate should now be
between 1/32" and 1/16" clear-
ance. See Figure 11-103.