Subaru Car 1998-05

Leak Testing

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  1. After 15 minutes (or more) of evacuation, close the high-pressure manifold valve.
  2.  
  3. Close the low-pressure manifold valve.
  4.  
  5. Turn off the vacuum pump.
  6.  
  7. Note the low side gauge reading, and after 5 minutes re-check the lower pressure gauge reading.
  8.  
  9. If the vacuum reading has changed more than 4 kPa (1 inHg), a full leak test is necessary using Refrigerant Leak Detector.
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  11. Begin at the connection of the high-pressure tube to the evaporator, and work your way along the high-pressure side of the system to the compressor.
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  13. Check the following tube connections with the leak detector:
    1. The area where the fitting meets the tube.
    2.  
    3. The area where the two parts of the fitting join each other.
    4.  
    5. The area where the nut meets the tube.
    6.  

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  15. Check the area of the pressure switch (dual switch), and also check the seams of the receiver drier.
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  17. Check the connections of the tubes to the condenser, and also check any welded joints on the condenser.
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  19. Check the area where the hoses attach to the compressor.
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  21. Check around the machined portions of the compressor (where the compressor sections join each other).
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  23. If equipped, check the thermal limiter on the compressor housing.
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  25. Check the compressor shaft seal by probing near the center of the compressor clutch pulley.
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  27. Begin at the connection of the low pressure tube to the evaporator, and work your way along the low pressure of the system to the compressor.
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  29. Check the following tube connections with the leak detector:
    1. The area where the fitting joins the tube.
    2.  
    3. The area where the two parts of the fitting join each other.
    4.  

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  31. Visually inspect the rubber portions of the flexible hoses for cracking. Probe the rubber section, including the ends of any insulators or protectors which may cover sections of the rubber hose, and near the ends where the rubber meets the metal collar.
  32.  
  33. Use one or both of the following methods to check the evaporator assembly.
    1. Remove the drain hose from the case drain nipple. Hold the probe at the end of the case drain nipple for at least 10 seconds. Be certain to reconnect the drain hose when finished.
    2.  
    3. With the ignition key in the -ACC- position, run the blower on high speed for 1 minute, then turn the blower off. Place the probe in the center instrument panel vent, an turn the blower on low speed for 1 to 2 seconds, then turn the blower off. Leave the probe in the vent for at least 10 seconds.
    4.  

  34.  
  35. Visually inspect the inside of the service port caps. Make sure the rubber seal is in place on the inside of the caps. Disconnect the gauges from the vehicle and install the service port caps.
  36.  

 
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