Nissan Murano. Manual — part 797
HA-24
< PREPARATION >
PREPARATION
Commercial Service Tool
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Sealant or/and Lubricant
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HFC-134a (R-134a) Service Tool and Equipment
• Never mix HFC-134a (R-134a) refrigerant and/or its specified lubricant with CFC-12 (R-12) refrigerant and/
or its lubricant.
• Separate and non-interchangeable service equipment must be used for handling each type of refrigerant/
lubricant.
• Refrigerant container fittings, service hose fittings and service equipment fittings (equipment that handles
refrigerant and/or lubricant) are different between CFC-12 (R-12) and HFC-134a (R-134a). This is to avoid
mixed use of the refrigerants/lubricant.
• Never use adapters that convert one size fitting to another. Refrigerant/lubricant contamination occurs and
compressor malfunction may result.
Tool name
Description
Refrigerant identifier equipment
Checking for refrigerant purity and
system contamination
RJIA0197E
Tool name
Description
HFC-134a (R-134a) refrigerant
Container color: Light blue
Container marking: HFC-134a (R-
134a)
Fitting size: Thread size
• Large container 1/2
″
-16 ACME
A/C System Oil Type S (DH-PS)
Type: Polyalkylene glycol oil (PAG),
type S (DH-PS)
Application:
HFC-134a (R-134a) swash plate com-
pressors
Capacity: 40 m
(1.4 US fl oz, 1.4 Imp
fl oz)
S-NT196
JMIIA1759ZZ
LUBRICANT
HA-25
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PERIODIC MAINTENANCE
LUBRICANT
Maintenance of Lubricant Quantity
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The lubricant in the compressor circulates through the system with refrigerant. Add lubricant to the compres-
sor when replacing any component or after a large refrigerant leakage is occurred. It is important to maintain
the specified amount of lubricant.
The following malfunctions may result if lubricant quantity is not maintained normally:
• 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 ACCORDING TO THE FOLLOWING
PROCEDURE
1.
Start the engine, and set to the following conditions:
-
Engine speed: Idling to 1,200 rpm
-
A/C switch: ON
-
Fan (blower) speed: Maximum speed set
-
Intake door position: Recirculation (REC)
-
Temperature setting: Full cold
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-26, "Lubricant Adjusting Procedure for Compressor Replacement"
NO
>> Refer to
HA-25, "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
: A/C System Oil Type S
HA-26
< PERIODIC MAINTENANCE >
LUBRICANT
*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-13, "Working with HFC-134a (R-134a)"
.
4.
Discharge refrigerant into the recovery/recycling equipment. Measure lubricant that is 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 that was 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 the amount that was drained from the old compres-
sor. Add this lubricant to the new compressor through the suction port opening.
8.
Measure an amount of new lubricant equal to the amount that was recovered during discharging. Add this
lubricant to the 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
LUBRICANT
HA-27
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Do not add this 5 m (0.2 US fl oz, 0.2 Imp fl oz) of lubricant when replacing the compressor only.
RJIA3578E
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