Subaru Impreza 2003, Service Manual

Page: 2742 / 3610

AC-24
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
REFRIGERANT LEAK CHECK
5. Refrigerant Leak Check
A: INSPECTION
1) Operate the A/C system for approx. 10 minutes,
and confirm that the high-pressure side shows at
least 690 kPa (7.03 kg/cm
2
, 100 psi). Then stop the
engine to start the leak test.
2) Starting from the connection between the high-
pressure 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 the pressure
switch (dual pressure switch) and high-pressure
pipe.
4) Check the connections between the 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 the 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 the low-
pressure 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 two parts
• Connection between the 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.
CAUTION:
Carefully check the external surface of hoses
and tubes at approx. 25 mm (0.98 in) per sec-
ond.
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 ON position, and run
the blower at high speed for 1 minute. Stop the
blower to check the ventilation grille on the instru-
ment 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 service port
cap.
AC-00035
(A) Flexible hose
AC-00036
(A)
AC-00037
AC-00038