|
|
|
FLUORESCENT LEAK DETECTOR HA-29 < PERIODIC MAINTENANCE > C D E F G H J K L M A B HA N O P FLUORESCENT LEAK DETECTOR Checking of Refrigerant Leaks INFOID:0000000007356310 PRELIMINARY CHECK Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C oil leak- age, damage, and corrosion. Any A/C oil leakage may indicate an area of refrigerant leakage. Allow extra inspection time in these areas when using either an electronic refrigerant leak detector (J-41995) or fluores- cent dye leak detector (J-42220). If any dye is observed using a fluorescent dye leak detector (J-42220), confirm the leak using a electronic refrigerant leak detector (J-41995). It is possible that the dye is from a prior leak that was repaired and not properly cleaned. When searching for leaks, do not stop when one leak is found but continue to check for additional leaks at all system components and connections. When searching for refrigerant leaks using an electronic refrigerant leak detector (J-41995), move the probe along the suspected leak area at 25 - 50 mm (1 - 2 in) per second and no further than 6 mm (1/4 in) from the component. CAUTION: Moving the electronic refrigerant leak detector probe slower and closer to the suspected leak area will improve the chances of finding a leak. Checking System for Leaks Using the Fluorescent Dye Leak Detector INFOID:0000000007356311 1. Check the A/C system for leaks using the fluorescent dye leak detector and safety goggles (J-42220) in a low sunlight area (area without windows preferable). Illuminate all components, fittings and lines. The dye will appear as a bright green/yellow area at the point of leakage. Fluorescent dye observed at the evapo- rator drain opening indicates an evaporator core assembly leak (tubes, core or expansion valve). 2. If the suspected area is difficult to see, use an adjustable mirror or wipe the area with a clean shop rag or cloth, then inspect the shop rag or cloth with the fluorescent dye leak detector (J-42220) for dye residue. 3. After the leak is repaired, remove any residual dye using refrigerant dye cleaner (J-43872) to prevent future misdiagnosis. 4. Perform a system performance check and then verify the leak repair using a electronic refrigerant leak detector (J-41995). NOTE: • Other gases in the work area or substances on the A/C components, for example, anti-freeze, wind- shield washer fluid, solvents and oils, may falsely trigger the leak detector. Make sure the surfaces to be checked are clean. • Clean with a dry cloth or blow off with shop air. • Do not allow the sensor tip of the electronic refrigerant leak detector (J-41995) to contact with any sub- stance. This can also cause false readings and may damage the detector. Dye Injection INFOID:0000000007356312 NOTE: This procedure is only necessary when recharging the system or when the compressor has seized and must be replaced. 2 , 50 psi). 2. Pour one bottle 7.4 cc (1/4 ounce) of the HFC-134a (R-134a) fluorescent leak detection dye (J-41447) into the HFC-134a (R-134a) dye injector (J-41459). CAUTION: If repairing the A/C system or replacing a component, pour the HFC-134a (R-134a) fluorescent leak detection dye (J-41447) directly into the open system connection and proceed with the service procedures. 3. Connect the refrigerant dye injector (J-41459) to the low-pressure service valve. (R-134a) fluorescent leak detection dye (J-41447) through the low-pressure service valve using HFC- 134a (R-134a) dye injector (J-41459). Refer to the manufacturer's operating instructions. August 2012 2012 Pathfinder |