CTS 2006-2007, CTS-V 2005-2007, DTS 2006-2007

Leak Testing


Caution: Avoid breathing the A/C Refrigerant 134a (R-134a) and the lubricant vapor or the mist. Exposure may irritate the eyes, nose, and throat. Work in a well ventilated area. In order to remove R-134a from the A/C system, use service equipment that is certified to meet the requirements of SAE J 2210 (R-134a recycling equipment). If an accidental system discharge occurs, ventilate the work area before continuing service. Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

Caution: For personal protection, goggles and gloves should be worn and a clean cloth wrapped around fittings, valves, and connections when doing work that includes opening the refrigerant system. If R-134a comes in contact with any part of the body severe frostbite and personal injury can result. The exposed area should be flushed immediately with cold water and prompt medical help should be obtained.

General Motors vehicles are now manufactured with fluorescent dye installed directly into the Air Conditioning (A/C) system. Leaks in the A/C system will be indicated in a light green or yellow color when using the leak detection lamp.

  1. Use the leak detection lamp in the following areas:

    All fittings or connections that use seal washers or O-rings
    All of the A/C components
    The A/C compressor shaft seal
    The A/C hoses and pressure switches
    The HVAC module drain tube, if the evaporator core is suspected of leaking
    The service port sealing caps
    The sealing cap is the primary seal for the service ports.

  3. Verifying some passive leaks may require using a halogen leak detector, even though the A/C system contains fluorescent dye.
  5. Follow the instructions supplied with the halogen leak detector. Clean and dry all surfaces in order to prevent a false warning.