Nissan Frontier. Manual - part 853

HA-4

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PRECAUTIONS

A/C Identification Label

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Vehicles with factory installed fluorescent dye have an identification label on the underside of hood.

Precaution for Refrigerant Connection

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A new type refrigerant connection has been introduced to all refrigerant lines except the following locations.

• Expansion valve to cooling unit

• Evaporator pipes to evaporator (inside cooling unit)

• Refrigerant pressure sensor

FEATURES OF NEW TYPE REFRIGERANT CONNECTION

• The O-ring has been relocated. It has also been provided with a groove for proper installation. This reduces

the possibility of the O-ring being caught in, or damaged by, the mating part. The sealing direction of the O-

ring is now set vertically in relation to the contacting surface of the mating part to improve sealing character-

istics.

• The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facili-

tating piping connections.

O-RING AND REFRIGERANT CONNECTION

SHA815E

PRECAUTIONS

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A/C Compressor and Condenser

CAUTION:

AWIIA1530GB

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

Front

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PRECAUTIONS

The new and former refrigerant connections use different O-ring configurations. Do not confuse O-

rings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at or

around the connection.

O-Ring Specifications

*: Always check with the Parts Department for the latest parts information.

WARNING:

Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is

less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.

CAUTION:

When replacing or cleaning refrigerant cycle components, observe the following.

• When the compressor is removed, store it in the same position as it is when mounted on the car.

Failure to do so will cause oil to enter the low pressure chamber.

• When connecting tubes, always use a torque wrench and a back-up wrench.

• After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture.

• When installing an air conditioner in the vehicle, connect the pipes as the final stage of the opera-

tion. Do not remove the seal caps of pipes and other components until just before required for con-

nection.

• Allow components stored in cool areas to warm to working area temperature before removing seal

caps. This prevents condensation from forming inside A/C components.

• Thoroughly remove moisture from the refrigeration system before charging the refrigerant.

• Always replace used O-rings.

• When connecting tube, apply oil to circle of the O-rings shown in illustration. Be careful not to apply

oil to threaded portion.

Oil name: Genuine NISSAN A/C System Oil Type R or equivalent.

• O-ring must be closely attached to dented portion of tube.

• When replacing the O-ring, be careful not to damage O-ring and tube.

• Connect tube until you hear it click, then tighten the nut or bolt by hand until snug. Make sure that

the O-ring is installed to tube correctly.

Connection 

type

O-ring 

size

D mm (in)

W mm (in)

New

8

6.8 (0.268)

1.85 (0.0728)

Former

10

9.25 (0.3642)

1.78 (0.0701)

New

12

10.9 (0.429)

2.43 (0.0957)

Former

11.0 (0.433)

2.4 (0.094)

New

16

13.6 (0.535)

2.43 (0.0957)

Former

14.3 (0.563)

2.3 (0.091)

New

19

16.5 (0.650)

2.43 (0.0957)

Former

17.12 (0.6740)

1.78 (0.0701)

New

24

21.8 (0.858)

2.4 (0.094)

SHA814E

PRECAUTIONS

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• After connecting line, conduct leak test and make sure that there is no leakage from connections.

When the refrigerant leaking point is found, disconnect that line and replace the O-ring. Then tighten

connections of seal seat to the specified torque.

Precaution for Service of Compressor

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• Plug all openings to prevent moisture and foreign matter from entering.

• When the compressor is removed, store it in the same position as it is when mounted on the car.

• When replacing or repairing compressor, follow “Maintenance of Oil Quantity in Compressor”

exactly. Refer to 

HA-16, "Maintenance of Oil Quantity in Compressor"

.

• Keep friction surfaces between clutch and pulley clean. If the surface is contaminated with oil, wipe

it off by using a clean waste cloth moistened with thinner.

• After compressor service operation, turn the compressor shaft by hand more than 5 turns in both

directions. This will equally distribute oil inside the compressor. After the compressor is installed,

let the engine idle and operate the compressor for 1 hour.

• After replacing the compressor magnet clutch, apply voltage to the new one and check for normal

operation. Refer to 

HA-27, "Removal and Installation for Compressor Clutch"

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Precaution for Service Equipment

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RECOVERY/RECYCLING EQUIPMENT

Follow the manufacturer's instructions for machine operation and machine maintenance. Do not introduce any

refrigerant other than that specified into the machine.

ELECTRONIC LEAK DETECTOR

Follow the manufacturer's instructions for tester operation and tester maintenance.

VACUUM PUMP

1.

Plug

2.

O-ring

A.

Torque wrench

B.

Apply oil

C.

Do not apply oil to thread

D.

No good

E.

Good

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