Page 2673 of 3051

Low-pressure Side Sometimes Becomes Negative.NLHA0151S05
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side sometimes
becomes negative.
AC354A
+Air conditioning system
does not function and
does not cyclically cool
the compartment air.
+The system constantly
functions for a certain
period of time after com-
pressor is stopped and
restarted.Refrigerant does not dis-
charge cyclically.
↓
Moisture is frozen at expan-
sion valve outlet and inlet.
↓
Water is mixed with refriger-
ant.+Drain water from refriger-
ant or replace refrigerant.
+Replace liquid tank.
Low-pressure Side Becomes Negative.NLHA0151S06
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side becomes nega-
tive.
AC362A
Liquid tank or front/rear side
of expansion valve’s pipe is
frosted or dewed.High-pressure side is closed
and refrigerant does not flow.
↓
Expansion valve or liquid
tank is frosted.Leave the system at rest
until no frost is present. Start
it again to check whether or
not the problem is caused by
water or foreign particles.
+If water is the cause, ini-
tially cooling is okay. Then
the water freezes causing
a blockage. Drain water
from refrigerant or replace
refrigerant.
+If due to foreign particles,
remove expansion valve
and remove particles with
dry and compressed air
(not shop air).
+If either of the above
methods cannot correct
the problem, replace
expansion valve.
+Replace liquid tank.
+Check lubricant for con-
tamination.
TROUBLE DIAGNOSES
Insufficient Cooling (Cont’d)
HA-82
Page 2674 of 3051
Insufficient Heating
TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT HEATING=NLHA0152SYMPTOM: Insufficient heating.
INSPECTION FLOW
NHA391
*1: LC-19 (QG), LC-38 (SR),
LC-59 (YD)
*2: LC-12 (QG), LC-32 (SR),
LC-54 (YD)*3: LC-15 (QG), LC-35 (SR),
LC-57 (YD)
*4: LC-20 (QG), LC-38,
LC-60*5: HA-40
TROUBLE DIAGNOSES
Insufficient Heating
HA-83
Page 2675 of 3051
Noise
TROUBLE DIAGNOSIS PROCEDURE FOR NOISE=NLHA0158SYMPTOM:
+Noise
INSPECTION FLOW
NHA395
*1:—
*2:—
*3: HA-87*4: EM-17 (QG), EM-86 (SR),
EM-166 (YD)*5: LC-19 (QG), LC-38 (SR),
LC-59 (YD)
TROUBLE DIAGNOSES
Noise
HA-84
Page 2676 of 3051
HFC-134a (R-134a) Service ProcedureNLHA0159SETTING OF SERVICE TOOLS AND EQUIPMENTNLHA0159S01Discharging RefrigerantNLHA0159S0101WARNING:
Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. Remove HFC-134a (R-134a) from A/C system using certified service equipment meeting require-
ments of HFC-134a (R-134a) recycling equipment or HFC-134a (R-134a) recovery equipment. If acci-
dental system discharge occurs, ventilate work area before resuming service. Additional health and
safety information may be obtained from refrigerant and lubricant manufacturers.
SHA539DE
Evacuating System and Charging RefrigerantNLHA0159S0102
SHA540DC
SERVICE PROCEDURE
HFC-134a (R-134a) Service Procedure
HA-85
Page 2677 of 3051
SHA383F
*1: HA-87
*2: HA-100*3: HA-101 *4: HA-76
SERVICE PROCEDURE
HFC-134a (R-134a) Service Procedure (Cont’d)
HA-86
Page 2678 of 3051

Maintenance of Lubricant Quantity in
Compressor
NLHA0160The lubricant in the compressor circulates through the system with
the refrigerant. Add lubricant to compressor when replacing any
component or after a large gas leakage occurred. It is important to
maintain the specified amount.
If lubricant quantity is not maintained properly, the following mal-
functions may result:
+Lack of lubricant: May lead to a seized compressor
+Excessive lubricant: Inadequate cooling (thermal exchange
interference)
LUBRICANTNLHA0160S01Name: Nissan A/C System Oil Type S for CSV613 compressor
Part number: KLH00-PAGS0
CHECKING AND ADJUSTINGNLHA0160S02Adjust the lubricant quantity according to the test group shown
below.
1 LUBRICANT RETURN OPERATION
Can lubricant return operation be performed?
+A/C system works properly.
+There is no evidence of a large amount of lubricant leakage.
YesorNo
Ye s©GO TO 2.
No©GO TO 3.
2 PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS
1. Start engine, and set the following conditions:
+Test condition
Engine speed: Idling to 1,200 rpm
A/C or AUTO switch: ON
Blower speed: Max. position
Temp. control: Optional [Set so that intake air temperature is 25 to 30°C (77 to 86°F).]
2. Perform lubricant return operation for about 10 minutes.
3. Stop engine.
CAUTION:
If excessive lubricant leakage is noted, do not perform the lubricant return operation.
©GO TO 3.
3 CHECK COMPRESSOR
Should the compressor be replaced?
YesorNo
Ye s©GO TO HA-89.
No©GO TO 4.
SERVICE PROCEDURE
Maintenance of Lubricant Quantity in Compressor
HA-87
Page 2679 of 3051
4 CHECK ANY PART
Is there any part to be replaced? (Evaporator, condenser, liquid tank or in case there is evidence of a large amount of
lubricant leakage.)
YesorNo
Ye s©GO TO HA-89.
No©Carry out the A/C performance test.
SERVICE PROCEDURE
Maintenance of Lubricant Quantity in Compressor (Cont’d)
HA-88
Page 2680 of 3051

Lubricant Adjusting Procedure for Components
Replacement Except Compressor
=NLHA0160S0201After replacing any of the following major components, add the
correct amount of lubricant to the system.
Amount of lubricant to be added
Part replacedLubricant to be added to
system
Remarks
Amount of lubricant
m!(Imp fl oz)
Evaporator 75 (2.6)—
Condenser 75 (2.6)—
Liquid tank 5 (0.2)Add if compressor is not
replaced. *1
In case of refrigerant
leak30 (1.1) Large leak
—Small leak *2
*1: If compressor is replaced, addition of lubricant is included in the table.
*2: If refrigerant leak is small, no addition of lubricant is needed.
Lubricant Adjustment Procedure for Compressor
Replacement
NLHA0160S02021. Discharge refrigerant into the refrigerant recovery/recycling
equipment. Measure lubricant discharged into the recovery/
recycling equipment.
2. Drain the lubricant from the“old”(removed) compressor into a
graduated container and recover the amount of lubricant
drained.
3. Drain the lubricant from the“new”compressor into a separate,
clean container.
4. Measure an amount of new lubricant installed equal to amount
drained from“old”compressor. Add this lubricant to“new”com-
pressor through the suction port opening.
5. Measure an amount of new lubricant equal to the amount
recovered during discharging. Add this lubricant to“new”com-
pressor through the suction port opening.
6. If the liquid tank also needs to be replaced, add an additional
5m!(0.2 Imp fl oz) of lubricant at this time.
Do not add this 5 m!(0.2 Imp fl oz) of lubricant if only
replacing the compressor.
SERVICE PROCEDURE
Maintenance of Lubricant Quantity in Compressor (Cont’d)
HA-89