Buick LeSabre 1965 Service Manual page 810

ACCESSORIES
OPTIONAL HEATER-AIR CONDITIONER SYSTEM 1 1 - 7 7
1 1 - 1 5 SERVICE
PROCEDURES
IMPORTANT: If a r e c e i v e r -
dehydrator is replaced, the port
of the r e c e i v e r - d e h y d r at or
marked "IN" must be attached
to condenser outlet.
NOTE: See paragraphs 11-16 and
11-17 for service procedures on
compressor assembly.
a. Safety Precautions
The following safety precautions
should always be used when serv-
icing the air conditioner refrig-
eration system.
1. Do not leave drum of Refrig-
erant-12 uncapped.
2. Do not carry drum in passen-
ger compartment of car.
3. Do not subject drum to high
temperature.
4. Do not weld or steam clean
near system.
5. Do not fill drum completely.
6. Do not discharge refrigerant
vapor into area where flame is
exposed, or do not discharge di-
rectly into engine air intake.
7. Do not expose eyes to liquid
refrigerant; always wear safety
goggles.
b. Installation Precautions
1. All subassemblies are shipped
sealed and dehydrated. They are
to remain sealed until just prior
to making connections.
2. All subassemblies should be at
room temperature before uncap-
ping. This prevents condensation
of moisture from air that enters
the system.
3. All precautions should be taken
to prevent damage to fittings or
connections. Even minute damage
to a connection could cause it to
leak.
4. Any fittings with grease or
dirt on them should be wiped
clean with a cloth dipped in al-
cohol. Do not clean fittings or
hoses with chlorinated salts such
as trichlorethylene, as they are
contaminants. If dirt, grease or
moisture gets inside the pipes and
cannot be removed, the pipe is to
be replaced.
5. Use a small amount of refrig-
eration oil on all tube and hose
joints and lubricate the "O" ring
seal in this oil before assembling
the joint as this oil will help in
making a leakproof joint. When
tightening joints, use a second
wrench to hold the stationary part
of the connection to prevent twist-
ing, and to prevent hose kinking
as kinked hoses are apt to trans-
mit noise and vibration.
CAUTION: Tighten all connec-
tions in accordance with recom-
mended torques. See pipe and
hose connection chart. See Fig-
ure 11-47. Insufficient t o r q u e
when tightening can result in loose
joints. Over-tightening can result
in distorted joint parts, and either
condition can result in refrig-
erant leakage.
6. Do not c o n n e c t receiver-
dehydrator assembly until all
other seals of assemblies have
been connected. This is neces-
sary to insure optimum dehydra-
tion and maximum m o i s t u r e
protection of the system.
c. Discharging Refrigerant
From Air Conditioner
System
NOTE: When a part is removed
or disconnected that is in the Air
Conditioner refrigeration circuit,
the r e f r i g e r a n t must be dis-
charged from system using the
following procedure.
1. Remove protective caps from
Schrader valve gauge fittings on
suction throttle valve and dis-
charge line located at rear of
compressor.
Figure 11-87—Manifold and Gage
Set, J-5725-01
2. Using Adapters J-5420, con-
nect charging lines of pressure
gauge and set Manifold and Gauge
Set J-5725-01 (see Figure 11-87)
to Schrader valves as shown in
Figure 11-153 with both valves of
manifold closed.
3. Slowly open valves on manifold
and discharge all pressure from
system.
CAUTION: Do not open valves too
fast as excessive oil will be blown
out of system. Place rag over
end of discharge service line to
prevent oil or liquid refrigerant
from spraying on car or person.
d. Adjustments—45000,
46000 and 48000 Series
There is no service adjustment on
the blower switch, the expansion
v a l v e , or the vacuum disc
switches.
1. Temperature and Defroster
Control Wire Adjustment - The
air conditioner - heater wires are
adjusted by rotating the adjuster
nuts which are part of the control
wire assembly.
To adjust any of the control wires,
set control levers in off position.
Then rotate the adjuster so that
the lever on instrument panel has
1/8 to 3/16" spring-back from
full off position.
IMPORTANT: A l w a y s recheck
adjustment working lever back
and forth thru travel.