Maintenance And Adjustments; General Service Information And Safety Precautions; Charging And Discharging System - Opel 1900 1973 Service Manual

Operating Normal
Restriction or leakage in air ducts, A/C outlets not
opening.

MAINTENANCE AND ADJUSTMENTS

GENERAL SERVICE INFORMATION AND SAFETY
PRECAUTIONS
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
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 "0" ring gasket with
in effectitig a leak-proofjoint and assist the "0" ring
to slip into the proper location without being cut or
damaged. Always use new "0" 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
torques (see Division VI, Specifications).
Do not connect receiver-dehydrator assembly until
all other connections have been made. This is neces-
sary to itisure maximum moisture removal from sys-
tem.
It is important that air conditioning hoses do not rest
sary. Because of the high frequency at which the
compressor operates, the passenger compartment is
susceptible to transfer of noise.
Safety Piecautions
The following safety precautions should always be
servicing refrigerant charged compo-
REFRIGERANT COMPONENTS ALL MODELS
Check for the following:
removed,
with recommended
2. Do not carry cylinder in passenger compartment
of car.
3. Do not subject cylinder to high temperatures.
4. Do not weld or steam clean on or near cylinder.
5. Do not fill cylinder completely.
6. Do not discharge vapor into area where flame is
exposed or directly into engine air intake.
7. Do not expose eyes to liquid - WEAR SAFETY
GOGGLES whenever discharging, charging or leak
testing system.
CHARGING AND DISCHARGING
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 9B-41.
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 clockwise.
Evacuating the System
When the refrigeration system is depressurized and
opened for service, some air will enter the lines, re-
gardless of how quickly openings are capped. In or-
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.
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 refrigera-
tion systems.
Preparations for Evacuating Complete System
1. Check the low pressure gauge for proper calibra-
SYSTEM