Nissan Altima L32. Instruction — part 801
HA-24
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REFRIGERATION SYSTEM
REFRIGERATION SYSTEM
HFC-134a (R-134a) Service Procedure
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SETTING OF SERVICE TOOLS AND EQUIPMENT
WARNING:
Avoid breathing the A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose, and throat.
Remove the HFC-134a (R-134a) from the A/C system using certified service equipment meeting the
requirements of SAE J2210 (R-134a recycling equipment) or SAE J2201 (R-134a recovery equipment).
If an accidental system discharge occurs, ventilate the work area before resuming service. Additional
health and safety information may be obtained from the refrigerant and oil manufacturers.
Discharging Refrigerant
Evacuating System and Charging Refrigerant
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REFRIGERATION SYSTEM
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Discharging, Evacuating, and Recharging the A/C System
Checking of Refrigerant Leaks
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Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C oil leak-
age, damage and corrosion. A/C oil leakage may indicate an area of refrigerant leakage. Allow extra inspec-
tion time in these areas when using either an electronic refrigerant leak detector or fluorescent dye leak
detector.
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HA-21, "Maintenance of Oil Quantity
in Compressor"
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HA-25, "Checking of Refrigerant
Leaks"
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HA-4, "Contaminated Refrigerant"
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HA-25, "Checking of Refrigerant
Leaks"
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HA-26
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REFRIGERATION SYSTEM
If dye is observed, confirm the leak with an electronic refrigerant leak detector. It is possible a prior leak 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 leak detector, 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 leak detector probe slower and closer to the suspected leak area will improve
the chances of finding a leak.
FLUORESCENT LEAK DETECTOR
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FLUORESCENT LEAK DETECTOR
Checking System for Leaks Using the Fluorescent Leak Detector
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1. Check A/C system for leaks using the UV lamp 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 evaporator drain opening indi-
cates 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, with the UV lamp 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 verify the leak repair with an approved electronic refrigerant
leak detector.
NOTE:
Other gases in the work area or substances on the A/C components, for example, anti-freeze, windshield
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 detector to contact with any substance. This can also cause false readings
and may damage the detector.
Dye Injection
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NOTE:
This procedure is only necessary when recharging the A/C system or when the compressor has seized and
has been replaced.
1. Check the A/C system static (at rest) pressure. Pressure must be at least 345 kPa (3.52 kg/cm
2
, 50 psi).
2. Pour one bottle (1/4 ounce / 7.4 cc) of the A/C refrigerant dye into the injector tool (J-41459).
CAUTION:
If repairing the A/C system or replacing a component, pour the dye directly into the open system
connection and proceed with the service procedures.
3. Connect the injector tool to the A/C LOW PRESSURE side service valve.
4. Start the engine and switch the A/C ON and fan ON.
5. While the A/C is 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 manufacturer's oper-
ating instructions.
6. With the engine still running, disconnect the injector tool from the low-pressure service valve.
7. Operate the A/C system for a minimum of 20 minutes to mix the dye with the system oil. Depending on the
leak size, operating conditions and location of the leak, it may take from a few minutes to a few days for
the dye to penetrate the leak and become visible.
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