Infiniti G37 Coupe. Manual — part 745
HA-26
< ON-VEHICLE MAINTENANCE >
LUBRICANT
ON-VEHICLE MAINTENANCE
LUBRICANT
Maintenance of Lubricant Quantity
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The lubricant in the compressor circulates through the system the refrigerant. Add lubricant to compressor
when replacing any component or after a large refrigerant leakage occurred. It is important to maintain the
specified amount.
If lubricant quantity is not maintained properly, the following malfunctions may result:
• Lack of lubricant: May lead to a seized compressor.
• Excessive lubricant: Inadequate cooling (thermal exchange interference)
LUBRICANT
LUBRICANT RETURN OPERATION
Adjust the lubricant quantity according to the test group shown below.
1.
CHECK LUBRICANT RETURN OPERATION
Can lubricant return operation be performed?
• A/C system works normally.
• There is no evidence of a large amount of lubricant leakage.
CAUTION:
Never perform the lubricant return operation if excessive lubricant leakage is noted.
Is it successful?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS PER THE FOLLOWING
1.
Start the engine, and set to the following conditions:
-
Engine speed: Idling to 1,200 rpm
-
A/C switch: ON
-
Blower speed: Max. position
-
Temp. control: Optional [Set so that intake air temperature is 25 to 30
°
C (77 to 86
°
F).]
-
Intake position: Recirculation (REC)
2.
Perform lubricant return operation for approximately 10 minutes.
3.
Stop the engine.
>> GO TO 3.
3.
CHECK REPLACEMENT PART
Should the compressor be replaced?
YES
>> Refer to
HA-27, "Lubricant Adjusting Procedure for Compressor Replacement"
NO
>> Refer to
HA-26, "Lubricant Adjusting Procedure for Components Replacement Except Compres-
Lubricant Adjusting Procedure for Components Replacement Except Compressor
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Add the correct amount of lubricant to the system after replacing any of the following major components.
Amount of lubricant to be added:
Name
: NISSAM A/C System Oil Type S
LUBRICANT
HA-27
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*1: No addition of lubricant is needed if the refrigerant leakage is small.
Lubricant Adjusting Procedure for Compressor Replacement
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1.
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 NG.
2.
Connect recovery/recycling recharging equipment to vehicle. Confirm refrigerant purity in supply tank
using recovery/recycling recharging equipment and refrigerant identifier. Refer to
if NG.
3.
Confirm refrigerant purity in vehicle A/C system using recovery/recycling recharging equipment and refrig-
erant identifier. If NG, refer to
HA-12, "Working with HFC-134a (R-134a)"
.
4.
Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure lubricant discharged into
the recovery/recycling equipment.
5.
Drain the lubricant from the old (removed) compressor into a graduated container and recover the amount
of lubricant drained.
6.
Drain the lubricant from the new compressor into a separate. Then clean container.
7.
Measure an amount of new lubricant installed equal to amount drained from old compressor. Add this
lubricant to new compressor through the suction port opening.
8.
Measure an amount of new lubricant equal to the amount recovered during discharging. Add this lubricant
to new compressor through the suction port opening.
9.
Add another 5 m (0.2 US fl oz., 0.2 Imp fl oz.) of lubricant at this time if the liquid tank also needs to be
replaced.
Part replaced
Lubricant to be added to system
Remarks
Amount of lubricant
m
(US fl oz., Imp fl oz.)
Evaporator
75 (2.5, 2.6)
—
Condenser
35 (1.2, 1.2)
—
Liquid tank
10 (0.3, 0.4)
—
In case of refrigerant leakage
30 (1.0, 1.1)
Large leakage
—
Small leakage
*1
HA-28
< ON-VEHICLE MAINTENANCE >
LUBRICANT
Do not add this 5 m (0.2 US fl oz., 0.2 Imp fl oz.) of lubricant when replacing the compressor only.
RJIA3578E
REFRIGERATION SYSTEM
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REFRIGERATION SYSTEM
Inspection
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1.
CHECK BLOWER MOTOR OPERATION
Check blower motor operation. Refer to
HAC-77, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-
TURE SEPARATELY CONTROL SYSTEM : Component Function Check"
(Without left and right ventilation
temperature separately control system) or
HAC-81, "WITH LEFT AND RIGHT VENTILATION TEMPERA-
TURE SEPARATELY CONTROL SYSTEM : Component Function Check"
(With left and right ventilation tem-
perature separately control system).
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace the parts according to the inspection results.
2.
CHECK COMPRESSOR OPERATION
Check compressor operation. Refer to
HAC-85, "Component Function Check"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace the parts according to the inspection results.
3.
CHECK REFRIGERANT CYCLE PRESSURE
Connect refrigerant recovery/recycling recharging equipment to the vehicle and perform the diagnosis with the
gauge pressure. Refer to
HA-7, "Trouble Diagnosis For Unusual Pressure"
Is the inspection result normal?
YES
>> Perform the performance test. Refer to
.
NO
>> Repair or replace the parts according to the inspection results.
Performance Chart
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TEST CONDITION
Testing must be performed as per the following:
TEST READING
Recirculating-to-discharge Air Temperature Table
Vehicle condition
Indoors or in the shade (in a well-ventilated place)
Doors
Closed
Door windows
Open
Hood
Open
TEMP.
Max. COLD
Mode switch
(Ventilation) set
Intake switch
(Recirculation) set
Fan (blower) speed
Max. speed set
Engine speed
Idle speed
Operate the air conditioning system for 10 minutes before taking measurements.
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature at center ventilator
°
C (
°
F)
Relative humidity
%
Air temperature
°
C (
°
F)
50 - 60
20 (68)
6.3 - 7.9 (43 - 46)
25 (77)
10.6 - 12.8 (51 - 55)
30 (86)
14.8 - 17.6 (59 - 64)
35 (95)
19.0 - 22.3 (66 - 72)
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