Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 1995-1999 Approved Subaru Legacy 1997 1997 Service Manual MECHANICAL COMPONENTS SECTION AIR CONDITIONING SYSTEM MSA5TCD97L3746

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SERVICE PROCEDURE 4-7
8. Leak Testing

8. Leak Testing
The following points should be kept in mind when conduct-
ing a refrigerant leak test.
1) The A/C 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 A/C 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
With gauges connected to the A/C system, operate the A/C
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).

G4M0609

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.
NOTE:
Since refrigerant oil absorbs refrigerant, excess oil on or
near a connection may falsely signal a leak.

3. CALIBRATE LEAK DETECTOR
Refer to the manufacturer's instructions for the particular
type of detector used and calibrate the instrument.
CAUTION:
Always make sure that the probe tip filter is clean and
free of contamination.

B4M0089

23
4-7 SERVICE PROCEDURE
8. Leak Testing

4. LEAK TEST -- HIGH-PRESSURE SIDE
Operate the A/C system for approx. 10 minutes, then turn
the engine off and begin the leak test.
1) Begin at the connection of the high-pressure tube to the
evaporator, and work your way along the high- pressure
side of the system to the compressor. There are three
places to check on each tube connection.
2) Check the area.
(1) Check the area where the fitting joins the tube.
G4M0612

(2) Check the area where the two parts of the fitting
join each other.

G4M0613

(3) Check the area where the nut joins the tube.

G4M0614

3) Check the area of the sight glass and pressure switch
(dual switch), and also check the seams of the receiver
drier.
4) Check the connections of the tubes to the condenser,
and also check any welded joints on the condenser.
CAUTION:
An oily area on the fins of the condenser may indicate
a leak.
5) Check the area where the hoses attach to the compres-
sor.
6) Check around the machined portions of the compressor
(where the compressor sections join each other).
7) If equipped, check the thermal limiter on the compres-
sor housing.
8) Check the compressor shaft seal by probing near the
center of the compressor clutch pulley.
NOTE:
Some shaft seals have a very slight amount of normal
leakage [approximately 28 g (1.0 oz) per year].

24
SERVICE PROCEDURE 4-7
8. Leak Testing

5. LEAK TEST -- LOW-PRESSURE SIDE
1) Begin at the connection of the low-pressure tube to the
evaporator, and work your way along the low-pressure of
the system to the compressor. There are three places to
check on each tube connection.
2) Check the area.
(1) Check the area where the fitting joins the tube.
(2) Check the area where the two parts of the fitting
join each other.
G4M0615

(3) Check the area where the nut joins the tube.

G4M0616

6. CHECK THE FLEXIBLE HOSES
Visually inspect the rubber portions of the flexible hoses for
cracking. Probe the rubber section, including the ends of
any insulators or protectors which may cover sections of
the rubber hose, and near the ends where the rubber
meets the metal collar.
NOTE:
Be certain to move the probe slowly [approximately 25 mm
(1 in) per second] when probing along any length of hose
G4M0617 or tube.
7. CHECK THE EVAPORATOR ASSEMBLY
1) Use one or both of the following methods to check the
evaporator assembly.
2) Remove the drain hose from the case drain nipple. Hold
the probe at the end of the case drain nipple for at least 10
seconds. Be certain to reconnect the drain hose when fin-
ished.
3) With the ignition key in the "ACC" position, run the
blower on high speed for 1 minute, then turn the blower off.
G4M0618 Place the probe in the center instrument panel vent, an turn
the blower on low speed for 1 to 2 seconds, then turn the
blower off. Leave the probe in the vent for at least 10 sec-
onds.

25
4-7 SERVICE PROCEDURE
8. Leak Testing - 9. Lubrication

8. CHECK THE SERVICE PORT CAPS
Visually inspect the inside of the service port caps. Make
sure the rubber seal is in place on the inside of the caps.
Disconnect the gauges from the vehicle and install the
service port caps.

G4M0619

9. Lubrication
1. SYSTEM OIL STABILIZATION
Prior to opening the refrigerant system for repairs (except
compressor seizure) the system must be stabilized for cor-
rect oil replenishment.
Follow these procedures:
1) Engine speed set to 1,500 rpm
2) A/C "ON"
3) Air source to recirculate
4) Blower in 4th or high speed position

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