Opel 1900 1973, Service Manual, Page: 550 / 625

REFRIGERANT COMPONENTS ALL MODELS
41
Operating Normal
Check for the following:
Restriction or leakage in air ducts, A/C outlets not
opening.
2. Do not carry cylinder in passenger compartment
of car.
3. Do not subject cylinder to high temperatures.
MAINTENANCE AND ADJUSTMENTS
4. Do not weld or steam clean on or near cylinder.
5. Do not cylinder completely.
GENERAL SERVICE INFORMATION AND SAFETY
PRECAUTIONS
6. Do not discharge vapor into area where flame is
exposed or directly into engine air intake.
General Information
All subassemblies are shipped sealed and dehy-
drated. They are to remain sealed until just prior to
making connections, and should be at room tempera-
ture before uncapping. This prevents condensation of
moisture from air that enters the system.
All precautions should be taken to prevent damage
to fittings or connections. Even minute damage to a
connection could cause it to leak. Any fittings with
grease or dirt on them should be wiped clean with a
cloth dipped in alcohol.
Do not clean fitting or hoses with solvents because
they are contaminants. If dirt, grease or moisture
gets inside the pipes or hoses and cannot be
removed,
the pipe or hose is to be replaced. Use a small amount
of clean refrigeration oil on all tube and hose con-
necting joints, and lubricate the
ring gasket with
oil before assembling the joint. The oil will help
in a leak-proofjoint and assist the ring
to slip into the proper location without being cut or
damaged. Always use new
rings.
When tightening joints, use a second wrench to hold
the stationary part of the connection to prevent
twisting and to prevent hose kinking. Kinked hoses
are apt to transmit noise and vibration. Tighten all
connections in accordance with recommended
torques (see Division VI, Specifications).
7. Do not expose eyes to liquid WEAR SAFETY
GOGGLES whenever discharging, charging or leak
testing system.
CHARGING AND DISCHARGING SYSTEM
Removal of any part in the refrigerant circuit will
require discharging of the entire system.
Discharging the System
1. Remove caps from gauge fittings on the compres-
sor adapter fitting on the compressor.
2. With both valves on manifold gauge set (J-5725-
04) closed (clockwise), attach manifold to the com-
pressor adapter fitting on the compressor, using
J-5420 valve adapter at suction gauge fitting and
J-9459 valve adapter at discharge gauge fitting. See
Figure
3. Fully open high pressure valve on manifold gauge
set to allow escape of refrigerant from system
through the manifold gauge set and out the center
fitting and hose. (Place end of hose in clean container
to collect oil loss due to rapid discharge of system).
4. When hissing ceases, indicating all refrigerant
has escaped, close high pressure valve on manifold
gauge set by turning valve
Do not connect receiver-dehydrator assembly until
all other connections have been made. This is neces-
sary to
maximum moisture removal from sys-
tem.
It is important that air conditioning hoses do not rest
or contact body sheet metal except where neces-
sary. Because of the high frequency at which the
compressor operates, the passenger compartment is
susceptible to transfer of noise.
Evacuating the System
When the refrigeration system is and
opened for service, some air enter the lines,
gardless of how quickly openings are capped. In
der to remove this air and as much as possible of the
moisture it contains, the complete system must be
evacuated. Evacuating is merely the process of
removing all air from the system, thereby creating a
vacuum in the system.
Safety Piecautions
The following safety precautions should always be
servicing refrigerant charged
Under no circumstances should alcohol be used in
the system in an attempt to remove moisture,
less of the successful use of alcohol in other
tion systems.
Preparations for Evacuating Complete System
Do not leave Refrigerant-12 cylinder uncapped.
1. Check the low pressure gauge for proper