NISSAN PATROL 1998 Y61 / 5.G Heather And Air Conditioner Workshop Manual

COMPONENT INSPECTION
Sunload sensor
Measure voltage between auto amp. terminalj10and body ground.
+When checking sunload sensor, select a place where sun
shines directly on it.
RHA684G
SHA930E
TROUBLE DIAGNOSESAUTO
Sunload Sensor (Cont'd)
HA-109

Intake Sensor
COMPONENT DESCRIPTION
The intake sensor is located on the cooling unit. It converts tem-
perature of air after it passes through the evaporator into a resis-
tance value. The value is then input to the auto ampli®er.
DIAGNOSTIC PROCEDURE
SYMPTOM: Intake sensor circuit is open or shorted.
CHECK INTAKE SENSOR CIRCUIT
BETWEEN INTAKE SENSOR AND AUTO
AMP.
Disconnect intake sensor harness connec-
tor.
Do approx. 5 volts exist between intake
sensor harness terminal No.j
25and body
ground?
Ye s
cNo
Disconnect auto amp. har-
ness connector.
Note
Check circuit continuity
between intake sensor har-
ness terminal No.j
25and
auto amp. harness terminal
No.j
25.
Continuity should exist.
If OK, check harness for
short.
OK
Disconnect auto amp. harness connector.
Replace auto amp.
Note
Check circuit continuity between intake
sensor harness terminal No.j
24and auto
amp. harness terminal No.j24.
Continuity should exist.
If OK, check harness for short.
OK
CHECK INTAKE SENSOR.
(Refer to HA-111.)
OK
cNG
Replace intake sensor.
Replace auto amp.
Note:
If the result is NG or No after checking circuit continuity, repair harness
or connector.
RHA685G
RHA957FA
RHA686G
RHA687G
RHA688G
.
..
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.
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TROUBLE DIAGNOSESAUTO
HA-110

COMPONENT INSPECTION
Intake sensor
After disconnecting intake sensor harness connector, measure
resistance between terminalsj
25andj24at sensor harness side,
using the table below.
Temperature ÉC (ÉF) Resistance kW
þ20 (þ4) 16.2
þ10 (14) 9.8
0 (32) 6.0
10 (50) 3.94
20 (68) 2.64
25 (77) 2.12
30 (86) 1.82
40 (104) 1.27
RHA689G
TROUBLE DIAGNOSESAUTO
Intake Sensor (Cont'd)
HA-111

HFC-134a (R-134a) Service Procedure
Set the recovery/recycling equipment.
Recovered lubricant. Refer to
``CHECKING AND ADJUSTING'',
HA-114.
c
Discharge refrigerant into recovery/
recycling equipment.
Repair or replace parts.
Evacuate (over 25 minutes).b
Check air tightness.
OK
*1
cNGRepair.m
Partial charging [approx. 200 g
(7.05 oz)].
Preliminary refrigerant leak check.
Refer to ``PRELIMINARY CHECK'',
HA-119.
OK
*1
cNG
Complete charging (speci®ed amount
less partial charge amount)
Refer to SDS.
*2
Check for refrigerant leaks.
Refer to ``CHECKING PROCEDURE'',
HA-120.
OK
NG
Check for A/C operation and A/C cool-
ing performance..................
Performance Test Diagnoses
Refer to HA-33.
Remove service couplers from A/C
service valves.
Recover refrigerant in charging hoses.
Remove service tools.
Reinstall service valve caps.
Note: *1 Before charging refrigerant, ensure engine is OFF.
*2 Before checking for leaks, start engine to activate air conditioner system then turn engine OFF.
Service valve caps must be installed to prevent leakage.
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SERVICE PROCEDURESMANUAL AND AUTO
HA-112

SETTING OF SERVICE TOOLS AND EQUIPMENT
DISCHARGING REFRIGERANT
WARNING:
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 certi®ed 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.
EVACUATING SYSTEM AND CHARGING REFRIGERANT
SHA539DC
SHA540DC
SERVICE PROCEDURESMANUAL AND AUTO
HFC-134a (R-134a) Service Procedure (Cont'd)
HA-113

Maintenance of Lubricant Quantity in
Compressor
The lubricant used to lubricate 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 speci®ed 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)
LUBRICANT
Name: Nissan A/C System Oil Type S
Part number: KLH00-PAGS0
CHECKING AND ADJUSTING
Adjust the lubricant quantity according to the ¯owchart shown
below.
START
Can lubricant return operation be per-
formed?
+A/C system works properly.
+There is no evidence of a large amount of
lubricant leakage.
No
cYe s
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.
Should the compressor be replaced?
No Yes
b
jA(Go to next page.)
Is there any part to be replaced?
(Evaporator, condenser, liquid tank or in
case there is evidence of a large amount of
lubricant leakage.)
No
cYe s
After replacing any of the following major components, add the correct
amount of lubricant to the system.
Amount of lubricant to be added
*1: If compressor is replaced, addition of lubricant is included in the ¯ow
chart.
*2: If refrigerant leak is small, no addition of lubricant is needed.
Carry out the A/C performance test.b
Part replacedLubricant to be added to sys-
tem
Remarks
Amount of lubricant
m!(Imp ¯ 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
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SERVICE PROCEDURESMANUAL AND AUTO
HA-114

jA
1. Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure lubricant discharged into the recovery/
recycling equipment.
2. Remove the drain plug of the ``old'' (removed) compressor. Drain the lubricant into a graduated container and record the
amount of drained lubricant.
3. Remove the drain plug and 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''
compressor through the suction port opening.
5. Measure an amount of new lubricant equal to the amount recovered during discharging. Add this lubricant to ``new'' compres-
sor through the suction port opening.
6. Torque the drain plug.
14-16Nzm (1.4 - 1.6 kg-m, 10 - 12 ft-lb)
7. If the liquid tank also needs to be replaced, add an additional 5 m!(0.2 Imp ¯ oz) of lubricant at this time.
Do not add this 5 m!(0.2 Imp ¯ oz) of lubricant if only replacing the compressor.
RHA065DE
.
SERVICE PROCEDURESMANUAL AND AUTO
Maintenance of Lubricant Quantity in
Compressor (Cont'd)
HA-115

Ventilation Air Filter
FUNCTION
Air inside passenger compartment is kept clean at either recircula-
tion or fresh mode by installing ventilation air ®lter into cooling unit.
REPLACEMENT TIMING
Replace ventilation air ®lter.
Refer to ``PERIODIC MAINTENANCE'' in MA section.
Caution label is ®xed inside the glove box.
REPLACEMENT PROCEDURES
+Remove glove box.
+Remove instrument reinforcement from instrument panel.
+Remove ventilation air ®lter ®xed clip.
+Take out ventilation air ®lter from cooling unit.
+Replace with new one and reinstall on cooling unit.
+Reinstall instrument reinforcement, glove box and undercover.
RHA042G
SHA868E
RHA953F
SERVICE PROCEDURESMANUAL AND AUTO
HA-116

Refrigerant Lines
+Refer to page HA-3 regarding ``Precautions for Refrigerant
Connection''.FOR LHD MODELS
RD engine
RHA747G
SERVICE PROCEDURESMANUAL AND AUTO
HA-117

FOR RHD MODELS
RD engine
RHA740G
SERVICE PROCEDURESMANUAL AND AUTO
Refrigerant Lines (Cont'd)
HA-118