HHR 2006-2008

Leak Testing

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CAUTION
Before beginning this procedure, refer to the Precautions at the beginning of this section. Only a MVAC-trained, EPA-certified, automotive technician should service the A/C system or its components.


NOTE
General Motors vehicles are currently manufactured with fluorescent dye installed directly into the Air Conditioning (A/C) system.



The fluorescent dye mixes and flows with the PAG oil throughout the refrigerant system
 
Verifying some passive leaks may require using the Halogen Leak Detector J 39400-A, even though the A/C system contains fluorescent dye
 
The only time that adding additional fluorescent dye is required is after flushing the A/C system
 
Fluorescent dye will assist in locating any leaks in the A/C system
 


NOTE
PAG oil is water soluble.



Condensation on the evaporator core or the refrigerant lines may wash the PAG oil and fluorescent dye away from the actual leak. Condensation may also carry dye through the HVAC module drain
 
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:
    NOTE
    To prevent false diagnosis in the future, thoroughly clean the residual dye from any area where leaks were found. Use a clean rag and the approved J 43872.



    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 as the sealing cap is the primary seal for the service ports
     

  2.  
  3. If necessary, inject fluorescent dye into the A/C system that is approved by General Motors:
    WARNING
    Not all of the fluorescent dyes are compatible with PAG oil. Some types of dye decrease the oil viscosity or may chemically react with the oil.


    NOTE
    R-134A leak detection dye requires time to work. Depending upon the leak rate, a leak may not become visible for between 15 minutes and 7 days.


    WARNING
    Do NOT overcharge the A/C system with dye. Use only one 0.25 oz (7.39 ml) charge.



    J 41447 can be poured directly into a removed A/C component
     
    J 46297-12 is injected into the low side port using J 46297
     

  4.  

Using The Halogen Leak Detector




CAUTION
Do not operate the detector in a combustible atmosphere since its sensor operates at high temperatures or personal injury and/or damage to the equipment may result.



Ensure that the vehicle has at least 1 lb. (0.45 kg) of refrigerant in the A/C refrigeration system in order to perform a leak test.
 


NOTE
Halogen leak detectors are sensitive to windshield washing solutions, many solvents and cleaners, and some adhesives used in the vehicle.



Clean and dry all surfaces in order to prevent a false warning. Liquids will damage the detector
 
Follow a continuous path in order to ensure that you will not miss any possible leaks. Test all areas of the system for leaks
 
Follow the instructions supplied with the Halogen Leak Detector J 39400-A
 

 
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