Nissan Leaf. Manual - part 741

HA-86

< BASIC INSPECTION >

[WITHOUT HEAT PUMP SYSTEM]

REFRIGERANT

6. Evacuate air for 10 minutes or more to remove any remaining refrigerant integrated to compressor lubri-

cant, etc.

7. Refrigerant recycle operation is complete.

Charge Refrigerant

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WARNING:

• Always use HFC-134a for refrigerant. If CFC-12 is accidentally charged, compressor is damaged due

to insufficient lubrication.

• Always observe and follow precautions described on refrigerant container. Incorrect handling may

result in an explosion of refrigerant container, frostbite, or the loss of eyesight.

• When charging with refrigerant gas, charge with the prescribed amount from a new service can.

• Do not breathe refrigerant gas and lubricant vapor or mist. Exposure my irritate eyes, nose, or

throat.

• Do not allow HFC-134a to be exposed to an open flame or others because it generates poisonous

gas when in contact with high temperature objects. Keep workshop well ventilated.

• To prevent fluorescent indicator from entering, prepare and use exclusive hose for EV (electric vehi-

cle) and HEV (hybrid vehicle) when connecting recovery/recycling/recharging equipment.

1. Connect manifold gauge (for HFC-134a) to the service valve.
2. Connect vacuum pump to manifold gauge and operate the pump. Apply vacuum to the cooler cycle for

approximately 25 minutes or longer.

CAUTION:

Evacuate air for 15 minutes or more if the parts are replaced.

3. Check the airtightness of A/C system for 25 minutes or more. If pressure raises more than the specified

level, charge A/C system with approximately 200 g (0.4 lb) refrigerant and check that there is no refriger-

ant leakage. Refer to 

HA-84, "Check Refrigerant Leakage"

.

CAUTION:

Check the airtightness for 15 minutes or more if the parts are replaced.

4. If parts other than compressor were replaced, add compressor oil according to parts that were replaced.

Refer to 

HA-87, "Lubricant Adjusting Procedure for Components Replacement Except Compressor"

.

5. Charge the A/C system from a service can with the specified amount of refrigerant.
6. Check that A/C system operates normally.
7. Disconnect manifold gauge.
8. Install A/C service valve cap.
9. Refrigerant charge is complete.

LUBRICANT

HA-87

< BASIC INSPECTION >

[WITHOUT HEAT PUMP SYSTEM]

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LUBRICANT

Description

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MAINTENANCE OF LUBRICANT LEVEL

The compressor lubricant is circulating in the system together with the refrigerant. It is necessary to fill com-

pressor with lubricant when replacing A/C system parts or when a large amount of refrigerant leakage is

detected. It is important to always maintain lubricant level within the specified level. Or otherwise, the following

conditions may occur.

• Insufficient lubricant amount: Stuck compressor

• Excessive lubricant amount: Insufficient cooling (caused by insufficient heat exchange)

Inspection

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If there is a malfunction (abnormal noise from inside, cooling failure) in the compressor unit, check the com-

pressor oil.

1.

CHECK COMPRESSOR OIL

1. Remove electric compressor. Refer to 

HA-95, "Removal and Installation"

.

2. Refer to the diagram and judge the drained compressor oil.

Judgment result 1:>>Replace only compressor.

Judgment result 2:>>Replace compressor and liquid tank.

Perform Lubricant Return Operation

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CAUTION:

If a large amount of refrigerant or lubricant leakage is detected, never perform lubricant return opera-

tion.
1. Start the vehicle and set to the following conditions.

• A/C switch: ON

• Blower motor speed: Maximum speed set 

• Intake switch: Recirculation set

• Temperature setting: Full cold

2. Perform lubricant return operation for approximately 10 minutes.
3. Stop A/C operation.
4. Oil return operation is complete.

Lubricant Adjusting Procedure for Components Replacement Except Compressor

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Fill with lubricant for the amount that is calculated according to the following conditions.
Example: Lubricant amount to be added when replacing evaporator and liquid tank [m  (Imp fl oz)] = 35 (1.2)

+ 10 (0.4) + 

α

Specified lubricant

AE10 (special oil for electric compressors)

JSIIA0927GB

HA-88

< BASIC INSPECTION >

[WITHOUT HEAT PUMP SYSTEM]

LUBRICANT

Lubricant Adjusting Procedure for Compressor Replacement

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1. Drain lubricant from removed compressor and measure lubricant amount.

1. Turn the compressor so that it faces downward, and drain

the compressor oil from high-pressure port (A) and low-

pressure port (B).

2. Measure total amount of lubricant that is drained from

removed compressor.

2. Drain lubricant from a new compressor that is calculated accord-

ing to the following conditions.

CAUTION:

If lubricant amount that is drained from removed compressor is less than 60 m  (2.1 Imp fl oz),
perform calculation by setting “D” as 40 m  (1.4 Imp fl oz).

Example: Lubricant amount to be drained from a new compressor when replacing compressor and liquid
tank [m  (Imp fl oz)] [D = 60 (2.1), 

α = 5 (0.2)]

150 (5.3) 

− [60 (2.1) + 20 (0.7) + 5 (0.2) + 5 (0.2)] = 60 (2.1)

3. Install compressor and check the operation.

Item

Lubricant amount to be added to A/C system 

m   (Imp  fl  oz)

Replace evaporator

35 (1.2)

Replace condenser

15 (0.5)

Replace liquid tank

5 (0.2)

Refrigerant leakage is detected

Large amount leakage

30 (1.1)

Small amount leakage

—

Lubricant amount that is recycled together with refrigerant during recycle operation

α

JMIIA2630ZZ

Amount to be drained (A)
[m  (Imp fl oz)] = F 

− (D + S + R + α)

F

: Lubricant amount that a new compressor con-
tains [150 (5.3)]

D

: Lubricant amount that is drained from removed 
compressor

S

: Lubricant amount that remains inside of removed 
compressor [20 (0.7)]

R

: Lubricant amount to be added according to com-
ponents that are removed except compressor

α

: Lubricant amount that is recycled together with 
refrigerant during recycle operation

Item

Lubricant amount to be added to A/C system 

m   (Imp  fl  oz)

Replace evaporator

35 (1.2)

Replace condenser

15 (0.5)

Replace liquid tank

5 (0.2)

JPIIA1455GB

PERFORMANCE TEST

HA-89

< BASIC INSPECTION >

[WITHOUT HEAT PUMP SYSTEM]

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PERFORMANCE TEST

Inspection

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INSPECTION PROCEDURE

1. Connect the manifold gauge set.
2. Set the vehicle, and set to the following condition.

Test condition

3. Maintain test condition until A/C system becomes stable. (Approximately 10 minutes)
4. Check that the characteristics for “intake temperature vs. discharge temperature” and “ambient tempera-

ture vs. pressure” are within the standard values.

5. When test results are within the specified value, inspection is complete.

If any of test result is out of the specified value, perform diagnosis by gauge pressure. Refer to 

HA-92,

"Trouble Diagnosis For Unusual Pressure"

.

Surrounding condition

Indoors or in the shade (in a well-ventilated place)

Vehicle condition

Door

Closed

Door glass

Full open

Hood

Open

A/C condition

Temperature control switch or 
dial

Full cold

A/C switch

ON

Mode switch

 (Ventilation) set

Intake switch

 (Recirculation) set

 Blower motor speed

Maximum speed set