Nissan Frontier D40. Instruction — part 720
ELECTRICAL LEAK DETECTOR
HA-23
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2.
When checking for leaks, circle each fitting completely with the
probe as shown.
3.
Move the probe along each component at a speed of approxi-
mately 25 - 50 mm (1 - 2 in)/second as shown.
CHECKING PROCEDURE
NOTE:
To prevent inaccurate or false readings, make sure there is no refrigerant vapor, shop chemicals, or cigarette
smoke in the vicinity of the vehicle. Perform the leak test in a calm area (low air/wind movement) so that the
leaking refrigerant is not dispersed.
1.
Turn the engine OFF.
2.
Connect the manifold gauge set (J-39183-C) to the A/C service ports. Refer to
3.
Check if the A/C refrigerant pressure is at least 345 kPa (3.52 kg/cm
2
, 50 psi) above a temperature of
16
°
C (61
°
F). If less than specification, recover/evacuate and recharge the system with the specified
amount of refrigerant. Refer to
HA-16, "HFC-134a (R-134a) Service Procedure"
.
NOTE:
At temperatures below 16
°
C (61
°
F), leaks may not be detected since the system may not reach 345 kPa
(3.52 kg/cm
2
, 50 psi) pressure.
4.
Perform the leak test from the high-pressure side (A/C compressor discharge “a” to evaporator inlet “f”) to
the low-pressure side (A/C evaporator drain hose “g” to shaft seal “k”). Refer to
.
Clean the component to be checked and carefully move the electronic refrigerant leak detector probe
completely around the following connections and components.
• Check the compressor shaft seal
• Check the high and low-pressure pipe and hose fittings, relief valve, and compressor shaft seal
• Check the liquid tank
• Check the refrigerant pressure sensor
• Check all around the service valves. Check that the service valve caps are screwed tightly on the ser-
vice valves (to prevent leaks).
NOTE:
After removing manifold gauge set (J-39183-C) from the service valves, wipe any residue from the ser-
vice valves to prevent any false readings by the electronic refrigerant leak detector (J-41995).
• Evaporator
With engine OFF, turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace in
the heater and cooling unit assembly. Wait a minimum of 10 minutes accumulation time (refer to the
manufacturer's recommended procedure for actual wait time) before inserting the electronic refrigerant
leak detector probe into the heater and cooling unit assembly drain hose.
NOTE:
Keep the probe inserted for at least 10 seconds. Use caution not to contaminate the probe tip with water
or dirt that may be in the drain hose.
SHA706E
SHA708EA
HA-24
< ON-VEHICLE MAINTENANCE >
ELECTRICAL LEAK DETECTOR
5.
If a leak is detected, verify at least once by blowing compressed air into the area of the suspected leak,
then repeat the leak check.
6.
Do not stop when one leak is found. Continue to check for additional leaks at all system components and
connections.
7.
If no leaks are found, perform steps 8 - 11.
8.
Start the engine.
9.
Set the heater A/C controls as follows:
a.
A/C switch to ON
b.
Air flow to VENT mode
c.
Intake position to RECIRCULATION mode
d.
Temperature to MAX cold
e.
Blower fan speed to HIGH
10. Run the engine at 1,500 rpm for at least 2 minutes.
11. Turn the engine OFF and perform the leak check again following
steps 4 through 6 above.
Refrigerant leaks should be checked immediately after turning
the engine OFF. Begin with the leak detector at the compressor.
The pressure on the high pressure side will gradually drop after
the refrigerant circulation stops and pressure on the low pres-
sure side will gradually rise, as shown in the graph. Some leaks
are more easily detected when the pressure is high.
12. Before connecting the recovery/recycling equipment to the vehicle, check the recovery/recycling equip-
ment gauges. No refrigerant pressure should be displayed. If pressure is displayed, recover the refriger-
ant from the equipment lines and then check the refrigerant purity.
13. Confirm refrigerant purity in supply tank using recovery/recycling equipment and refrigerant identifier
equipment.
14. Confirm the refrigerant purity in the vehicle's A/C system using recovery/recycling equipment and refriger-
ant identifier equipment.
15. Discharge the A/C system using recovery/recycling equipment. Repair the leaking fitting or component as
necessary.
16. Evacuate and recharge the A/C system and perform the leak test to confirm that there are no refrigerant
leaks.
17. Conduct the Operational Check to ensure system works properly. Refer to
.
SHA839E
REFRIGERATION SYSTEM
HA-25
< ON-VEHICLE REPAIR >
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ON-VEHICLE REPAIR
REFRIGERATION SYSTEM
Component
INFOID:0000000005272561
A/C Compressor and Condenser
WJIA1481E
HA-26
< ON-VEHICLE REPAIR >
REFRIGERATION SYSTEM
NOTE:
Refer to
HA-5, "Precaution for Refrigerant Connection"
HFC-134a (R-134a) Service Procedure
INFOID:0000000005272562
SETTING OF SERVICE TOOLS AND EQUIPMENT
Discharging Refrigerant
WARNING:
Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.
Remove HFC-134a (R-134a) refrigerant from the A/C system using certified service equipment meeting
requirements of SAE J2210 HFC-134a (R-134a) recycling equipment or SAE J2201 HFC-134a (R-134a)
recovery equipment. If an accidental system discharge occurs, ventilate the work area before resum-
ing service. Additional health and safety information may be obtained from the refrigerant and oil man-
ufacturers.
Evacuating System and Charging Refrigerant
1.
High-pressure service valve
2.
Clip
3.
High-pressure A/C pipe
4.
Refrigerant pressure sensor
5.
Condenser
6.
Compressor shaft seal
7.
High-pressure flexible A/C hose
8.
Low-pressure flexible A/C hose
9.
Low-pressure service valve
10. Low-pressure A/C pipe
11.
Expansion valve
12. A/C drain hose
1.
Shut-off valve
2.
A/C service valve
3.
Recovery/Recycling equipment
WJIA1160E
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