Impreza Outback Sport AWD F4-2.5L SOHC (2002)
Refrigerant: Testing and Inspection
Refrigerant Leak Check
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/sq.cm, 100 psi). Then
stop the engine to start the leak test.
2. Starting from the connection between the high-pressure tube 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 switch) and receiver dryer.
4. Check the connections between the condenser and tubes, 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 thermal limiter (if equipped) on the compressor housing.
8. 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 28 g (1.0 oz) per year. This is not a problem.
9. Starting from the connection between the low-pressure tube and evaporator, check the system for leakage along the high-pressure side through the
compressor. The following items must be checked thoroughly.
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Connection between the tube and tube fitting
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Connection between 2 parts
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Connection between the tube and nut
10. Visually check the rubber area of the flexible hose for cracks.
Check the entire length of the flexible hose, especially 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 second.
11. Disconnect the drain hose from the evaporator case, and check the hose end for at least 10 seconds.
