Subaru SVX 1992 Manual page 991

AUTOMATIC AIR CONDITIONING SYSTEM
[W801] 4-7
3) When the system is fully charged, close the low- pres-
sure manifold valve.
4) Close the valve at the refrigerant source .
Refrigerant capacity Unit : kg (Ib)
Refrigerant Minimum Maximum
R134a
0.6 (1 .3) 0.7 (1 .5)
:d
9. COMPLETE ALL SYSTEM CHECKS
1) Evaluate the system performance (refer to performance
testing section) .
2) Perform leak detection test .
Always perform leak checking in an environment free of
refrigerant pollution.
Do not disconnect the high- or low-pressure hoses from
the vehicle before leak checking.
10 . DISCONNECT THE MANIFOLD GAUGE SET
1) Remove the high- or low-pressure hoses from the service
ports and install the service port caps .
8 . Leak Testing
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B4-700
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Fig. 40
2. CLEAN CONNECTIONS BEFORE TESTING
Before testing, use a clean shop towel to wipe off refriger-
ant oil, dirt, or foreign material from all of the connections
and components to be tested .
Since refrigerant oil absorbs refrigerant, excess oil on or
near a connection may falsely signal a leak .
The following points should be kept in mind when conduct-
ing a refrigerant leak test.
1) The air conditioning system to be tested must have an
adequate refrigerant charge to begin with .
2) The area where the leak test is conducted must be free
of wind and drafts, with still air being the ideal condition.
3) The atmosphere where the leak test is conducted must
be free of refrigerant contamination .
4) Operate the air conditioning system for approx . 10
minutes, then turn the engine off an begin the leak test .
5) Refrigerant gas is heavier than air, therefore always hold
the probe below the connection being tested .
6) When checking for a leak along a length of hose or
tube, the leak detector probe must be moved slowly,
approx . 25 mm (1 in) per second making sure probe does
not come in contact with the component being tested .
7) When checking for a leak at a certain point, the leak
detector probe must be held at that point for at least 5
seconds.
1 . CHECK THE SYSTEM PRESSURE
1) With gauges connected to the air conditioning system,
operate the air conditioning and confirm that the high side
pressure is above 690 kPa (7.03 kg/cm2, 100 psi) . If not,
evacuate and charge the system before leak checking
(refer to evacuation and charging sections).
3. CALIBRATE LEAK DETECTOR
Refer to the manufacturer's instructions for the particular
type of detector used and calibrate the instrument .
Always make sure that the probe tip filter is clean and
free of contamination.
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84-462
Fig. 41
19