air condition NISSAN ALMERA N15 1995 Service Manual

DESCRIPTION
Control Operation
LHO models RHO
models
FAN CONTROL KNOB

This knob turns thefan ONand OFF, andcontrols fanspeed.

MODE CONTROL KNOB

This knob controls theoutlet airflow.

TEMPERATURE CONTROLKNOB

This knob allows adjustment ofthe temperature ofthe outlet air.

RECIRCULATION (REC)SWITCH

OFF position:
Outside airisdrawn intothepassenger compartment.
ON position:
Interior airisrecirculated insidethevehicle.
The indicator lampwillalso light.

AIR CONDITIONER SWITCH

The airconditioner switchcontrols the
Ale
system. Whentheswitch isdepressed withthefan ON, the
compressor willturn ON.The indicator lampwillalso light.

The airconditioner coolingfunction operates onlywhen theengine isrunning.
HA-13
•

TROUBLEDIAGNOSES
Contents
How toPerform TroubleDiagnoses forQuick andAccurate Repair HA-15
Operational Check HA-16
Symptom Chart HA-18
Preliminary Check HA-20
PRELIMINARY CHECK1

(A/C
does notblow coldair.) HA-20
PRELIMINARY CHECK2
(Air outlet doesnotchange.) HA-21
PRELIMINARY CHECK3
(Noise) HA-22
PRELIMINARY CHECK4
(I nsufficient heating) HA-23
Performance TestDiagnoses HA-24
INSUFFICIENT COOLING HA-24
Performance Chart HA-26
TEST CONDITION HA-26
TEST READING HA-26
Trouble Diagnoses forAbnormal Pressure HA-27
Harness Layout. HA-31
Circuit Diagram -Air Conditioner HA-34
Wiring Diagram -HEATER - HA-36
Wiring Diagram -AIC - HA-38
Main Power Supply andGround CircuitCheck HA-49
Diagnostic Procedure1
(SYMPTOM: Blowermotordoesnotrotate.) HA-50
Diagnostic Procedure2
(SYMPTOM: Intake doordoes notchange.) HA-52
Diagnostic Procedure3
(SYMPTOM: Magnetclutchdoesnotoperate when
A/C
switch andfanswitch areON.)
- For GAand SRengines HA-54
- For CDengine HA-59
Electrical Components Inspection HA-62
Control Linkage Adjustment HA-64
System Description HA-65
HA-14

TROUBLEDIAGNOSES
Operational Check

The purpose ofthe operational checkisto confirm thatthesys-
tem operates asitshould. Thesystems whicharechecked are
the blower, mode(discharge air),intake air,temperature
decrease, temperature increase.

CONDITIONS:
Engine running atnormal operating temperature.
RHA315F
RHA316F

Discharge airflow

Switch Airoutlet/distribution
model RHDmodels
LHDmodels
indicator FaceFootDefroster FaceFoot
Defroster

_e
100% 100%

II
-

- -
-

"#Ie
60%
40%

-
60%
40%
-

"J
-

80%
20%14%
65% 21%

,, -

60% 40%
13%57%
30%

W
-

-

100%
-
-
100%
RHA317F PROCEDURE:
1. Check blower

1) Turn fancontrol knobto1-speed.
Blower shouldoperate on1-speed.
2) Then turnfancontrol knobto2-speed.
3) Continue checking blowerspeeduntilallfour speeds are
checked.
4) Leave blower on4-speed.

2. Check discharge air.

1) Turn mode control knob.
2) Confirm thatdischarge aircomes outaccording tothe air
distribution tableatleft.
Refer to"Discharge AirFlow" in"DESCRIPTION" (HA-12).

HA-16

RHA318F
4.Check temperature decrease

~~ ~~~nC~ef~~~~~~ur~ cont:olknobtofull cold.
air atdischarge airoutlets.

TROUBLE
DIAGNOSES
Operational Check(Cont'd)

3. Check recirculation

1) Pre~s recirculation switch.
2) ~.eclrculati~n indicatorshouldlight
Isten forIntake doorposition ch'an
blower soundchange slightly). ge(you should hear

RHA319F
5.Check temperature increase

~~ ~~rn ~efmperatu:e controlknobtofull hot
ec orhot airatdischarge airoutlets:

RHA320F
6.Check airconditioner switch

Turn fancontrol knobtothe desired 1
a~? push theairconditioner 'th (to 4-speed) position
dltlOner.
SWI
ctoturn ONtheaircon-
The indicator lightshould com .
ON. eon when airconditioner is

•

RHA321F
HA-17

TROUBLEDIAGNOSES
Preliminary Check
PRELIMINARY CHECK1

Ale
does notblow coldair.
DOESAIRFLOW FROM VENTS?
Condition
• Engine running atoperating tem-
perature .
• Ignition switch,AICswitch, and
fan switch areON.
• Mode control knobisin VENT
mode andtemperature control
knob isinfull cold position.
Yes IS
BLOWER MOTOROPERATING
NORMALLY?
Yes
CHECKBLOWER
MOTOR OPERATION.
Go toDiagnostic Pro-
cedure 1.(HA-50)
CHECK COMPRESSOR BELTTEN-
SION. Refer to"Checking DriveBelts" in
MA section.
CHECK REFRIGERANT.
Connect manifold gaugethen
check system pressure.
Refer toPerformance Chart.(HA-

26)

NG CHECK
THERMO CONTROL AMP.
OPERATION.
Refer toElectrical Components
Inspection. (HA-63)
CHECK
FOREVAPORATOR COIL
FREEZE UP.
Remove intakeunit.Check ifevap-
orator freezes.
NG OK
(Freeze up.) (Doesnot
freeze up.)
CHECK VENTILATOR
DUCT FORAIR
LEAKS.
OK
Go toPerformance
Test Diagnoses. (HA-

24)
NG
CHECK
REFRIGERATION CYCLE
PRESSURE WITHMANIFOLD
GAUGE CONNECTED.
Refer toPerformance Chart.(HA-
26) OK
CHECK
COMPRESSOR OPERA-
TION.
OK
OK NG
Adjust orreplace
compressor belt.
Refer toMA section
("ENGINE
MAINTENANCE").
CHECKFORREFRIG-
ERANT LEAKS CHECK
WATER COCKOPERA-
TION.
Warm upengine beforechecking.
Refer toHA-64.
NG

Adjust orreplace watercock.
OK
Go toDiagnostic Procedure3.
(HA-54) CHECK
TEMPERATURE CONTROL
CABLE.
Refer toControl Linkage Adjust-
ment. (HA-64) NG
Adjust temperature controlcable.
OK
VISUALLY INSPECTAIRMIX
DOOR.
Access byremoving instrument
panel. NG
Replace airmix door.
OK
CHECK THERMO CONTROL AMP.
OPERATION. Refer toElectrical Components
Inspection. (HA-63)
HA-20

PRELIMINARY CHECK4
Insufficient heating TROUBLE
DIAGNOSES
Preliminary Check(Cont'd)

DOES AIRFLOW FROM FOOTAREA?
Condition:
• Vehicle atoperating temperature .
• Ignition switchandfancontrol knobareON.
• Mode control knobisin FOOT modeandtem-
perature controlknobisinfull hotposition.
Check thefollowing:
• Engine coolant level(Refer toMA section)
• Hoses forleaks orkinks
• Radiator cap(Refer toLC section)
• Air incooling system.
CHECK WATER COCKOPERATION.
Warm upengine before
checking.

Refer toHA-64.

OK

CHECK TEMPERATURE CONTROLCABLE.
Refer toControl Linkage Adjustment. (HA-64)
VISUALLY INSPECTAIRMIX DOOR.
Access byremoving instrument panel.

OK

Check byfeel theheater inletandoutlet hoses.
No
NG
NG
NG
NG
CHECK
BLOWER MOTOR
OPERATION.
Perform
Diagnostic Proce-
dure 1.
(Refer toHA-50.)
Repair/replace asneces-
sary .
Adjust orreplace water
cock.
Adjust temperature control
cable.
Replace airmix door.
Hot inlet
Warm outlet
Check thermostat installa-
tion.

OK
Both
hoses
warm
Check heater hosesforproper
installation.

OK

•

Back
flush heater core,drain andrefill cool-
ant. Retest.
Replace
thermostat. Refer
to LC section
("Thermostat", "ENGINE
COOLING SYSTEM"). Hot
inlet
Warm outlet
System OK

HA-23
Both
hoses
warm
Replace heater
core.

TROUBLEDIAGNOSES
Performance Chart
TEST CONDITION

Testing mustbeperformed asfollows:
Vehicle location: Indoorsorinthe shade (inawell-venti-
lated place)
Doors: Closed
Door window: Open
Hood: Open
TEMP.: Max.COLD
Discharge Air:Face Vent
REC switch: (Recirculation) set
FAN speed: Highspeed
Engine speed:Idlespeed
Operate theairconditioning systemfor10minutes before
taking measurements.

TEST READING
Recirculating-to-discharge airtemperature table

Inside air(Recirculating air)
at blower assembly inlet
Dischargeairtemperature atcenter ventilator
Relative humidity
Airtemperature .C
('F)

%
.C
('F)

25 (77) 11.4
-13.6 (53-56)
30 (86) 15.7-18.3 (60-65)
50 -60
35(95) 20.5-23.8 (69-75)
40 (104) 26.0-30.8 (79-87)
25 (77) 13.6-16.0 (56-61)
30 (86) 18.3-21.1 (65-70)
60 -70
35(95) 23.8-27.4 (75-81)
40 (104) 30.8-36.0 (87-97)
Ambient airtemperature-to-operating pressuretable

Ambient air
High-pressure(Dischargeside) Low-pressure
(Suctionside)
Relative humidity Airtemperature
kPa(bar,
kg/cm
2,
psi) kPa
(bar,
kg/cm
2,
psi)

%
.C
('F)

.

25 (77) 892
-1,138
118-226 (1.18 -2.26,1.2 -2.3,17 -33)
(8.92 -11.38, 9.1-11.6,129 -165)
30 (86) 1,108
-1,393
137-265 (1.37 -2.65,1.4 -2.7,20 -38)
(11.08 -13.93, 11.3-14.2, 161-202)
50 -70
35(95) 1,344
-1,677
177-314 (1.77 -3.14,1.8 -3.2, 26-46)
(1344 -16.77,13.7 -17.1, 195-243)
40 (104) 1,589
-1,971
226-373 (2.26 -3.73, 2.3-3.8, 33-54)
(15.89 -19.71,16.2 -20.1, 230-286)
HA-26

TROUBLEDIAGNOSES
Trouble Diagnoses forAbnormal Pressure
(Cont'd)

Correctiveaction
• Remove foreignparticles
by using compressed air.
• Check lubricant forcontam-
ination.
• Check andrepair malfunc-
tioning parts.
• Check lubricant forcontam-
ination.
Replace compressor.
• Drain water fromrefriger-
ant orreplace refrigerant.
• Replace liqUidtank.
Expansion
valvecloses alit-
tle compared withthespecifi-
cation.

1

Water ismixed withrefriger-
ant. Probable
cause

1

CD
Improper expansion valve
adjustment

@
Malfunctioning thermal
valve

@
Outlet andinlet maybe
clogged.
Low-pressure pipeisclogged
or crushed.
Compressor pressureopera-
tion isimproper.

1

Damaged insidecompressor
packings Refrigerant doesnotdis-
charge cyclically.

1

Moisture isfrozen atexpan-
sion valve outlet andinlet.
Refrigerant
cycle
There isabig temperature
difference betweenexpansion
valve inletandoutlet while
the valve itselfisfrosted.
An area ofthe low-pressure
pipe iscolder thanpreas
near theevaporator outlet.
• Air conditioning system
does notfunction anddoes
not cyclically coolthecom-
partment air.
• The system constantly func-
tions foracertain periodof
time after compressor is
stopped andrestarted.
Air
flow volume isnot

AC353A
enough oristoo low.
@ Gauge
indication
Both high- andlow-pressure
sides aretoolow.

l!]

Low-pressure sidesome-
times becomes negative.

Ii

AC354A
•

HA-29

TROUBLEDIAGNOSES
Circuit Diagram -Air Conditioner
DUAL-PRESSURE
SWITCH
AIR

CONDITIONER
RELAY
THERMO
CONTROL
AMP.

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SWITCH

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MOTOR

FAN
RESISTOR

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FAN SWITCH
OFF1234
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RECIRCULA
nON
SWITCH

1

AIT models

MIT
models
For Europe andIsrael
Except
@

GA engine models
Except
f
or Europe, Israe 1and Austra 1ia
GA eng ine
f
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Except
@

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AIT
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Except


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illumination
system

HHA001
HA-34

TROUBLEDIAGNOSES
Circuit Diagram -Air Conditioner (Cont'd)

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HA-35