NISSAN ALMERA N16 2001 Electronic Repair Manual

Both High- and Low-pressure Sides are Too High.NJHA0151S01
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high and low-pressure sides
are too high.
AC359A
+Pressure is reduced soon
after water is splashed on
condenser.Excessive refrigerant charge
in refrigeration cycleReduce refrigerant until speci-
fied pressure is obtained.
Air suction by cooling fan is
insufficient.Insufficient condenser cooling
performance
¯
1. Condenser fins are
clogged.
2. Improper fan rotation of
cooling fan+Clean condenser.
+Check and repair cooling
fan as necessary.
+Low-pressure pipe is not
cold.
+When compressor is
stopped high-pressure
value quickly drops by
approximately 196 kPa
(2.0 bar, 2 kg/cm
2, 28 psi).
It then decreases gradually
thereafter.Poor heat exchange in con-
denser
(After compressor operation
stops, high pressure
decreases too slowly.)
¯
Air in refrigeration cycleEvacuate repeatedly and
recharge system.
Engine tends to overheat. Engine cooling systems mal-
function.Check and repair each
engine cooling system.
+An area of the low-pres-
sure pipe is colder than
areas near the evaporator
outlet.
+Plates are sometimes cov-
ered with frost.+Excessive liquid refrigerant
on low-pressure side
+Excessive refrigerant dis-
charge flow
+Expansion valve is open a
little compared with the
specification.
¯
1. Improper thermal valve
installation
2. Improper expansion valve
adjustmentReplace expansion valve.
High-pressure Side is Too High and Low-pressure Side is Too Low.NJHA0151S02
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too high and
low-pressure side is too low.
AC360A
Upper side of condenser and
high-pressure side are hot,
however, liquid tank is not so
hot.High-pressure tube or parts
located between compressor
and condenser are clogged
or crushed.+Check and repair or
replace malfunctioning
parts.
+Check lubricant for con-
tamination.
TROUBLE DIAGNOSES
Insufficient Cooling (Cont'd)
HA-79

High-pressure Side is Too Low and Low-pressure Side is Too High.NJHA0151S03
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too low and
low-pressure side is too high.
AC356A
High and low-pressure sides
become equal soon after
compressor operation stops.Compressor pressure opera-
tion is improper.
¯
Damaged inside compressor
packingsReplace compressor.
No temperature difference
between high and low-pres-
sure sidesCompressor pressure opera-
tion is improper.
¯
Damaged inside compressor
packings.Replace compressor.
Both High- and Low-pressure Sides are Too Low.NJHA0151S04
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure sides
are too low.
AC353A
+There is a big temperature
difference between
receiver drier outlet and
inlet. Outlet temperature is
extremely low.
+Liquid tank inlet and
expansion valve are
frosted.Liquid tank inside is slightly
clogged.+Replace liquid tank.
+Check lubricant for con-
tamination.
+Temperature of expansion
valve inlet is extremely
low as compared with
areas near liquid tank.
+Expansion valve inlet may
be frosted.
+Temperature difference
occurs somewhere in
high- pressure sideHigh-pressure pipe located
between receiver drier and
expansion valve is clogged.+Check and repair malfunc-
tioning parts.
+Check lubricant for con-
tamination.
+Expansion valve and liquid
tank are warm or only cool
when touched.Low refrigerant charge
¯
Leaking fittings or compo-
nentsCheck refrigerant for leaks.
Refer to ªChecking Refriger-
ant Leaksº, HA-99.
There is a big temperature
difference between expan-
sion valve inlet and outlet
while the valve itself is
frosted.Expansion valve closes a
little compared with the
specification.
¯
1. Improper expansion valve
adjustment
2. Malfunctioning thermal
valve
3. Outlet and inlet may be
clogged.+Remove foreign particles
by using compressed air.
+Check lubricant for con-
tamination.
An area of the low-pressure
pipe is colder than areas
near the evaporator outlet.Low-pressure pipe is clogged
or crushed.+Check and repair malfunc-
tioning parts.
+Check lubricant for con-
tamination.
Air flow volume is not
enough or is too low.Evaporator is frozen.+Check thermo control
amp. operation.
+Replace compressor.
TROUBLE DIAGNOSES
Insufficient Cooling (Cont'd)
HA-80

Low-pressure Side Sometimes Becomes Negative.NJHA0151S05
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.NJHA0151S06
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-81

Insufficient Heating
TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT HEATING=NJHA0152SYMPTOM: Insufficient heating.
INSPECTION FLOW
NHA391
*1: LC-17 (QG),
LC-43 (YD)
*2: LC-12 (QG),
LC-37 (YD)*3: LC-15 (QG),
LC-40 (YD)
*4: LC-19 (QG),
LC-43 (YD)*5: HA-40
*6: HA-39
TROUBLE DIAGNOSES
Insufficient Heating
HA-82

Noise
TROUBLE DIAGNOSIS PROCEDURE FOR NOISE=NJHA0158SYMPTOM:
+Noise
INSPECTION FLOW
RHA925H
*1: HA-91
*2: HA-92
*3: HA-86*4: EM-15 (QG),
EM-84 (YD)*5: LC-17 (QG),
LC-43 (YD)
TROUBLE DIAGNOSES
Noise
HA-83

HFC-134a (R-134a) Service ProcedureNJHA0159SETTING OF SERVICE TOOLS AND EQUIPMENTNJHA0159S01Discharging RefrigerantNJHA0159S0101WARNING:
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 RefrigerantNJHA0159S0102
SHA540DC
SERVICE PROCEDURE
HFC-134a (R-134a) Service Procedure
HA-84

SHA383F
*1: HA-86
*2: HA-99*3: HA-100 *4: HA-75
SERVICE PROCEDURE
HFC-134a (R-134a) Service Procedure (Cont'd)
HA-85

Maintenance of Lubricant Quantity in
Compressor
NJHA0160The 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)
LUBRICANTNJHA0160S01Name: Nissan A/C System Oil Type R for DKV-11G compres-
sor
Part number: KLH00-PAGR0
Name: Nissan A/C System Oil Type S for CSV613 compressor
Part number: KLH00-PAGS0
CHECKING AND ADJUSTINGNJHA0160S02Adjust 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 30ÉC (77 to 86ÉF).]
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-88.
No©GO TO 4.
SERVICE PROCEDURE
Maintenance of Lubricant Quantity in Compressor
HA-86

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-88.
No©Carry out the A/C performance test.
SERVICE PROCEDURE
Maintenance of Lubricant Quantity in Compressor (Cont'd)
HA-87

Lubricant Adjusting Procedure for Components
Replacement Except Compressor
=NJHA0160S0201After 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) Ð
Condenser 75 (2.6) Ð
Liquid tank 5 (0.2)Add if compressor is not
replaced. *1
In case of refrigerant
leak30 (1.1) Large leak
Ð 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
NJHA0160S02021. Discharge refrigerant into the refrigerant recovery/recycling
equipment. Measure lubricant discharged into the recovery/
recycling equipment.
2. Drain the lubricant from the ªoldº (removed) compressor into a
graduated container and recover the amount of lubricant
drained.
3. Drain the lubricant from the ªnewº compressor into a separate,
clean container.
4. Measure an amount of new lubricant installed equal to amount
drained from ªoldº compressor. Add this lubricant to ªnewº 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 ªnewº 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-88