Subaru B9 TRIBECA WX 2007 Manual page 504

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5. Refrigerant Leak Check
A: INSPECTION
1) At engine speed below 1500 rpm, operate the A/
C system for approx. 10 minutes, and confirm that
the high-side pressure shows at least 690 kPa
2
(7.03 kg/cm , 100 psi). Then stop the engine to
start the leak test.
2) Starting from the connection between high-pres-
sure pipe and evaporator, check the system for
leaks along the high-pressure side through the
compressor. The following items must be checked
thoroughly.
3) Check the joint and seam between pressure
switch (triple pressure switch) and high-pressure
pipe.
4) Check the connections between condenser and
pipes, and welded joints on the condenser.
The leak tester may detect the oil on the condenser
fins as a leak.
5) Check the joint between compressor and hoses.
6) Check the machined area of the compressor and
other joints on the compressor.
7) Check the compressor shaft seal at the area
near the center of compressor clutch pulley.
Some shaft seals show a slight amount of leakage,
about 3 g (0.1 oz) per year. This is not a problem.
8) Starting from the connection between low-pres-
sure pipe and evaporator, check the system for
leakage along the low-pressure side through the
compressor. The following items must be checked
thoroughly.
• Connection between 2 parts
• Connection between pipe and plate
• Connection between pipes
Refrigerant Leak Check
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
9) Visually check the rubber area of the flexible
hose for cracks.
Check the entire length of the flexible hose, espe-
cially the connection with the metal hose end.
CAUTION:
Carefully check the external surface of hoses
and tubes at approx. 25 mm (0.98 in) per sec-
ond.
(A) Flexible hose
10) Disconnect the drain hose from the heater
case, and check the hose end for at least 10 sec-
onds.
After the test is finished, reconnect the drain hose.
11) Turn the ignition key to the ON position, and run
the blower at high speed for approx. 1 minute. Stop
the blower to check the ventilation grill on the instru-
ment panel. While moving the tester closer to the
grill, run the blower for 1 or 2 seconds, then stop it.
Check the grill at that point for at least 10 seconds.
12) Check the valve in the service port.
13) Visually check the rubber seal in the service
port cap.
AC-00035
AC-25
(A)
AC-00036
AC-00037
AC-00038