Owner's Manual

MTC-88
REFRIGERANT LINES
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 pres-
sure 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 the recovery/recycling recharging equipment to the vehicle, check recovery/recycling
recharging equipment 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 recovery/recycling recharging equipment and refrigerant
identifier. Refer to MTC-3, "
Contaminated Refrigerant" .
13. Confirm refrigerant purity in vehicle A/C system using recovery/recycling recharging equipment and refrig-
erant identifier. Refer to MTC-3, "
Contaminated Refrigerant" .
14. Discharge A/C system using approved recovery/recycling equipment. Refer to MTC-82, "
Discharging
Refrigerant" . Repair the leaking fitting or component as necessary.
15. Evacuate and recharge A/C system. Refer to MTC-82, "
Evacuating System and Charging Refrigerant" .
Perform the leak test to confirm no refrigerant leaks.
16. Conduct A/C performance test to ensure system works properly.
Fluorescent Dye Leak Detector EJS001BU
PRECAUTIONS FOR FLUORESCENT DYE LEAK DETECTION
● The fluorescent dye leak detector is not a replacement for an electronic refrigerant leak detector. The fluo-
rescent dye leak detector should be used in conjunction with an electronic refrigerant leak detector (J-
41995) to pinpoint refrigerant leaks.
● For your safety and your customer's satisfaction, read and follow all manufacturer's operating instructions
and precautions prior to performing the work.
● Refer to MTC-4, "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 indi-
cates an evaporator core assembly (tubes, core or expansion valve) 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 misdiag-
nosis.
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 MTC-4, "
Precautions for Leak Detection Dye" .
1. Check 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).
3. Connect the injector tool to the A/C LOW PRESSURE side service fitting.
4. Start engine and switch A/C ON.
SHA839E