Nissan Murano. Manual - part 799

 

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Nissan Murano. Manual - part 799

 

 

HA-32

< PERIODIC 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).

Recover/evacuate and recharge the system with the specified amount of refrigerant if it is less than spec-
ification.
NOTE:
Leakages may not be detected since the system may not reach 345 kPa (3.52 kg/cm

2

, 50 psi) at temper-

atures below 16

°

C (61

°

F).

4.

Perform the leakage 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 leakage check for the follow-
ing areas carefully. Clean the component to be checked and move the leakage 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 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 leakages).
NOTE:
Wipe any residue from valves to prevent any false readings by leak detector after removing A/C manifold
gauge set from service valves.
Cooling unit (Evaporator)
Turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace in the cooling unit with
engine OFF. Wait a minimum of 10 minutes (refer to the manufacturer’s recommended procedure for the
actual wait time) before inserting the leak detector probe into the drain hose.
Keep the probe inserted for at least 10 seconds. Be careful not to contaminate the probe tip with water or
dirt that may be in the drain hose.

5.

Verify at least once by blowing compressed air into area of suspected leakage, then repeat the check as
outlined above if a leak detector detects a leakage.

6.

Do not stop when one leakage is found. Continue checking for additional leakages at all system compo-
nents.
If no leakages are found, perform steps 7 - 10.

JPIIA0458GB

ELECTRICAL LEAK DETECTOR

HA-33

< PERIODIC MAINTENANCE >

C

D

E

F

G

H

J

K

L

M

A

B

HA

N

O

P

7.

Start the engine.

8.

Set the A/C control under the following conditions.

a.

A/C switch: ON

b.

Air flow: VENT (Ventilation)

c.

Intake door position: Recirculation

d.

Temperature setting: Full cold

e.

Fan (blower) speed: Maximum speed set

9.

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

10. Stop the engine and perform leakage check again following

steps 4 through 6 above.
Refrigerant leakages should be checked immediately after stop-
ping the engine. Begin with the leak detector at the compressor.
The pressure on the high-pressure side drops gradually after
refrigerant circulation stops and pressure on the low-pressure
side rises gradually, as shown in the graph. Some leakages are
more easily detected when pressure is high.

11. Check recovery/recycling recharging equipment gauges before connecting recovery/recycling recharging

equipment to vehicle. No refrigerant pressure should be displayed. Recover refrigerant from equipment
lines if pressure is displayed, 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 leakage test to confirm that there are no refrigerant

leakages.

16. Perform A/C performance test to ensure that the system works normally.

SHA839E

HA-34

< REMOVAL AND INSTALLATION >

REFRIGERATION SYSTEM

REMOVAL AND INSTALLATION

REFRIGERATION SYSTEM

Exploded View

INFOID:0000000009718636

Refer to 

HA-14, "Refrigerant Connection"

.

Inspection After Installation

INFOID:0000000009718637

SETTING OF SERVICE TOOLS AND EQUIPMENT

Discharging Refrigerant

WARNING:

Never breathe A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose or 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 equip-
ment]. Ventilate work area before resuming service if accidental system discharge occurs. Additional
health and safety information may be obtained from refrigerant and lubricant manufacturers.

1.

High-pressure pipe

2.

O-ring

3.

Condenser assembly

4.

High-pressure flexible hose

5.

Compressor

6.

Low-pressure flexible hose

7.

Low-pressure pipe

8.

Heater & cooling unit assembly

9.

Evaporator pipe assembly

10. Expansion valve

11.

Evaporator

: Always replace after every disassembly.

: N·m (kg-m, in-lb)

JPIIA1257GB

REFRIGERATION SYSTEM

HA-35

< REMOVAL AND INSTALLATION >

C

D

E

F

G

H

J

K

L

M

A

B

HA

N

O

P

Evacuating System and Charging Refrigerant

1.

Shut-off valve

2.

A/C service valve

3.

Recovery/Recycling Recharging 
equipment

JSIIA0238ZZ

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

JSIIA0239ZZ

 

 

 

 

 

 

 

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