- At engine speed below 1500rpm, operate the A/C system for approx. 10 minutes, and confirm that the high-side pressure shows at least 100 psi (690 kPa). Then stop the engine to start the leak test.
- Starting from the connection between 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.
- Check the joint and seam between pressure switch (dual switch) and high-pressure pipe.
- 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.
- Check the joint between compressor and hoses.
- Check the machined area of the compressor and other joints on the compressor.
- 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 0.1 oz (3 g) per year. This is not a problem.
Starting from the connection between 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 2 parts
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.
CAUTIONCarefully check the external surface of hoses and tubes at approx. 0.98 in (25 mm) per second.
- Disconnect the drain hose from the heater case, and check the hose end for at least 10 seconds. After the test is finished, reconnect the drain hose.
- 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 instrument 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.
- Check the valve in the service port.
- Visually check the rubber seal in the service port cap.