Infiniti G35 (V35) Sedan. Manual - part 751

HA-38

< ON-VEHICLE MAINTENANCE >

ELECTRICAL LEAK DETECTOR

2.

Connect a suitable A/C manifold gauge set (SST: J-39183) to the A/C service valves.

3.

Check if the A/C refrigerant pressure is at least 345 kPa (3.52 kg/cm

2

, 50 psi) above 16

°

C (61

°

F). If less

than specification, recover/evacuate and recharge the system with the specified amount of refrigerant.
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).

4.

Perform the leak test from the high-pressure side (compressor discharge a to evaporator inlet j) to the
low-pressure side (evaporator drain hose k to shaft seal p). Perform a leak check for the following areas
carefully. Clean the component to be checked and move the leak detected probe completely around the
connection/component.

Compressor
Check the fitting of high- and low-pressure flexible hoses, relief valve and shaft seal.
Condenser
Check the fitting of condenser pipe assembly, high-pressure flexible hose and pipe.
Liquid tank
Check the fitting of radiator & condenser assembly and refrigerant pressure sensor.
Service valves
Check all around the service valves. Ensure service valve caps are secured on the service valves (to pre-
vent leaks).
NOTE:
After removing A/C manifold gauge set from service valves, wipe any residue from valves to prevent any
false readings by leak detector.
Cooling unit (Evaporator)
With engine OFF, turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace in the
cooling unit. Wait a minimum of 10 minutes accumulation time (refer to the manufacturer’s recommended
procedure for actual wait time) before inserting the leak detector probe into the drain hose.
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.

5.

If a leak detector detects a leak, verify at least once by blowing compressed air into area of suspected
leak, then repeat check as outlined above.

JSIIA0010GB

ELECTRICAL LEAK DETECTOR

HA-39

< ON-VEHICLE MAINTENANCE >

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6.

Do not stop when one leak is found. Continue to check for additional leaks at all system components.
If no leaks are found, perform steps 7 - 10.

7.

Start the engine.

8.

Set the A/C control as follows;

a.

A/C switch: ON

b.

MODE door position: VENT (Ventilation)

c.

Intake door position: Recirculation

d.

Temperature setting: Max. cold

e.

Fan speed: High

9.

Run engine at 1,500 rpm for at least 2 minutes.

10. Stop the engine 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 recovery/recycling recharging equipment to vehicle, check recovery/recycling recharg-

ing 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.

13. Confirm refrigerant purity in vehicle A/C system using recovery/recycling recharging equipment and refrig-

erant identifier.

14. Discharge A/C system using approved refrigerant recovery equipment. Repair the leaking fitting or com-

ponent if necessary.

15. Evacuate and recharge A/C system and perform the leak test to confirm no refrigerant leaks.
16. Perform A/C performance test to ensure system works properly.

SHA839E

HA-40

< ON-VEHICLE REPAIR >

REFRIGERATION SYSTEM

ON-VEHICLE REPAIR

REFRIGERATION SYSTEM

Exploded View

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Refer to 

HA-17, "Refrigerant Connection"

.

Inspection After Installation

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SETTING OF SERVICE TOOLS AND EQUIPMENT

Discharging Refrigerant

WARNING:

Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. Remove HFC-134a (R-134a) from A/C system using certified service equipment meeting
requirements of SAE J-2210 [HFC-134a (R-134a) recycling equipment] or J-2209 [HFC-134a (R-134a)
recovery equipment]. If accidental system discharge occurs, ventilate work area before resuming ser-
vice. Additional health and safety information may be obtained from refrigerant and lubricant manu-
facturers.

1.

Blower unit

2.

O-ring

3.

Low-pressure pipe 2

4.

Low-pressure flexible hose

5.

Compressor

6.

Radiator & condenser assembly

7.

High-pressure flexible hose

8.

High-pressure pipe 1

9.

Heater & cooling unit assembly

10. Expansion valve

11.

Evaporator

12. High-pressure pipe 2

13. Low-pressure pipe 1

JSIIA0109GB

REFRIGERATION SYSTEM

HA-41

< ON-VEHICLE REPAIR >

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Evacuating System and Charging Refrigerant

1.

Shut-off valve

2.

A/C service valve

3.

Recovery/Recycling/Recharging 
equipment

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1.

Shut-off valve

2.

A/C service valve

3.

Recovery/Recycling/Recharging 
equipment

4.

Refrigerant container (HFC-134a)

5.

Weight scale (J-39650)

6.

Vacuum pump (J-39649)

7.

Manifold gauge set (J-39183)

A.

Preferred (best) method

B.

Alternative method

C.

For charging

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