Opel 1900 1973, Service Manual

Page: 548 / 625

REFRIGERANT COMPONENTS ALL MODELS
In all instances where the indications of refrigerant
shortage continues, additional refrigerant should be
added in
lb. increments until the sight glass is
clear.
An
additional charge of lb. should be ad-
ded as a reserve. In no case should the system be
overcharged.
LEAK TESTING SYSTEM
The following two methods are recommended when
attempting to locate refrigerant leaks in the system.
Loss of is always indicative of a leak since
refrigerant is not consumed and does not wear out.
1. Open Flame Method This method utilizes a gas
operated torch type leak detector (J-6084). Use of
this method is recommended when checking for
leaks in confined areas. To perform test, light torch
and adjust to obtain a pale blue flame, approximately
inch in height, in burner.
Explore for leaks by moving end of search tube
around suspected area. Check bottom of connections
since Refrigerant-12 is heavier than air and will be
more apparent at underside of fittings. The flame
color will turn yellow-green when a small leak is
detected. Large leaks will turn the flame blue or
purple.
WARNING:
Do not breathe fumes from
burning of
gas. These fumes
poisonous.
2. Liquid Leak Detectors This method utilizes a
solution which will bubble (soap solution) to signify
a gas leak. Use of this method of checking is recom-
mended for locating small leaks.
FUNCTIONAL TESTING SYSTEM
Functional testing is a measurement of the air condi-
tioner system performance to determine if discharge
air temperature, pressure in suction line, and pres-
sure in discharge line are within specific limitations.
To perform Functional test proceed as follows:
1. Remove protective caps from the compressor
adapter fittings located on compressor.
SCHRADER
ADAPTER J-5420
DISCHARGE LINE
VALVE
LOW PRESSURE
G A U G E
MANIFOLD AND
-GAUGE SET
J-5725-01
GAUGE LINES
(5) J-5418
Figure 9B-40 Functional Test Set-Up