Electronic Leak Detection

Inspection 

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  NOTE: Good ventilation is necessary in the area where electronic A/C leak testing is to be carried out. If the surrounding air is contaminated with refrigerant gas, the leak detector will indicate this gas all the time. Odors from other chemicals such as antifreeze, disc brake cleaner or other cleaning solvents can cause the same problem. Using a fan to ventilate the area to be tested before proceeding with the leak detection procedure is helpful in removing small traces of contamination from the air, but the fan should be turned off during actual testing.
  NOTE: R-134a is heavier than air, and will tend to move downward from the source of the leak if present. It is possible that a leak may not be detected if the leak detector tip is held above the leaking fitting, line or component. Always be sure to thoroughly leak test below the fitting, line or component for the presence of R-134a as well as leak testing above and around.
  NOTE: The system pressure should be between 413 kPa (59.9 psi) to 551 kPa (79.91 psi) at 24 C (75.2 F) with the electric motor off and cool. The pressure reading may be higher if the electric motor is hot.

  Leak test the refrigerant system using a general Electronic Leak Detector. Follow the instructions included with the general Electronic Leak Detector tool for handling and operation techniques.