Subaru Legacy 2004 Service Manual page 3386

HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
5. Refrigerant Leak Check
A: INSPECTION
1) Operate the A/C system for approx. 10 minutes,
and confirm that the high-side pressure shows at
least 690 kPa (7.03 kg/cm
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 (dual 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 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
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.
Refrigerant Leak Check
2
, 100 psi). Then stop the
AC-00035
CAUTION:
Carefully check the external surface of hoses
and tubes at approx. 25 mm (0.98 in) per sec-
ond.
(A)
(A) Flexible hose
10) Disconnect the drain hose from heater case,
and check the hose end for at least 10 seconds.
After the test is finished, reconnect the drain hose.
11) Turn the ignition key to ON position, and run
the blower at high speed for approx. 1 minute. Stop
the blower to check the ventilation grille on the in-
strument panel. While moving the tester closer to
the grille, run the blower for 1 or 2 seconds, then
stop it. Check the grille 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-24
AC-00036
AC-00037
AC-00038