Pathfinder 2WD V6-3.5L (VQ35) (2003)
1. A/C switch ON.
2. Face mode
3. Recirculation switch ON
4. Max cold temperature
5. Fan speed high
9. Run engine at 1,500 rpm for at least 2 minutes.
10. Turn engine off and perform leak check again following steps 4 through 6 above.
Refrigerant leaks should be checked immediately after stopping the engine. Begin with the leak detector at the compressor. The pressure on the
high pressure side will gradually drop after refrigerant circulation stops and pressure on the low pressure side will gradually rise, as shown in the
graph. Some leaks are more easily detected when pressure is high.
11. Before connecting ACR4 to vehicle, check ACR4 gauges. No refrigerant pressure should be displayed. If pressure is displayed, recover refrigerant
from equipment lines and then check refrigerant purity.
12. Confirm refrigerant purity in supply tank using ACR4 and refrigerant identifier.
13. Confirm refrigerant purity in vehicle A/C system using ACR4 and refrigerant identifier.
14. Discharge A/C system using approved refrigerant recovery equipment. Repair the leaking fitting or component as necessary.
15. Evacuate and recharge A/C system and perform the leak test to confirm no refrigerant leaks.
16. Conduct A/C performance test to ensure system works properly.
Fluorescent Dye Leak Detector
PRECAUTIONS FOR FLUORESCENT DYE LEAK DETECTION
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The fluorescent dye leak detector is not a replacement for an electronic refrigerant leak detector. The fluorescent dye leak detector should be used
in conjunction with an electronic refrigerant leak detector (J-41995) to pinpoint refrigerant leaks.
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For your safety and your customer's satisfaction, read and follow all manufacturers operating instructions and precautions prior to performing the
work.
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Refer to "Precautions for Leak Detection Dye".
CHECKING SYSTEM FOR LEAKS USING THE FLUORESCENT LEAK DETECTOR
1. Check A/C system for leaks using the UV lamp and safety glasses (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
evaporator drain opening indicates an evaporator core assembly (tubes, core or TXV) leak.
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 check the cloth with the UV
lamp for dye residue.
3. Confirm any suspected leaks with an approved electronic refrigerant leak detector.
4. After the leak is repaired, remove any residual dye using dye cleaner (J-43872) to prevent future misdiagnosis.
5. Perform a system performance check and verify the leak repair with an approved electronic refrigerant leak detector.
DYE INJECTION
(This procedure is only necessary when re-charging the system or when the compressor has seized and was replaced.) Refer to "Precautions for Leak
Detection Dye".
1. Check A/C system static (at rest) pressure. Pressure must be at least 345 kPa (3.52 kg/sq.cm, 50 psi).
2. Pour one bottle (1/4 ounce / 7.4 cc) of the A/C refrigerant dye into the injector tool (J-41459).
3. Connect the injector tool to the A/C LOW PRESSURE side service fitting.
4. Start engine and switch A/C ON.
5. With the A/C operating (compressor running), inject one bottle (1/4 ounce / 7.4 cc) of fluorescent dye through the low-pressure service valve
using dye injector tool J-41459 (refer to the manufacturers operating instructions).
6. With the engine still running, disconnect the injector tool from the service fitting.
CAUTION: Be careful not to allow dye to spray or drip when disconnecting the injector from the system.