engine NISSAN ALMERA N15 1995 Service Manual

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

Whenever system'shighand/or lowside pressure isabnormal, diagnoseusingamanifold gauge.The
marker abovethegauge scale
in
the following tablesindicates thestandard (normal)pressure range.
Since thestandard (normal)pressure, however,differsfromvehicle tovehicle, refertoHA-26 ("Ambi-
ent airtemperature-to-operating pressuretable").

Gauge indication
Both highandlow-pressure
sides aretoohigh.

m
Refrigerant
cycle
• Pressure isreduced soon
after water issplashed on
condenser. Probable
cause
Excessive refrigerant charge
in refrigeration cycle Corrective
action
Reduce refrigerant untilspec-
ified pressure isobtained.

•

Check
andrepair each
engine cooling system.
Replace expansion valve.
Evacuate
repeatedly and
recharge system.
Insufficient
condensercooling•Clean condenser.
performance •Check andrepair cooling

!
fanasnecessary.

CD
Condenser finsare
clogged.

@
Improper fanrotation of
cooling fan
Poor heatexchange incon-
denser (After compressor operation
stops, highpressure
decreases tooslowly.)

1

Air inrefrigeration cycle
Engine cooling systems mal-
function. • Excessive liquidrefrigerant
on low-pressure side
• Excessive refrigerant dis-
charge flow
• Expansion valveisopen a
little compared withthe
specification.

1

CD
Improper thermalvalve
installation

@
Improper expansion valve
adjustment
Air
suction bycooling fanis
insufficient.
• An area ofthe low-pres-
sure pipeiscolder than
areas neartheevaporator
outlet.
• Plates aresometimes cov-
ered withfrost.
•
Low-pressure pipeisnot
cold.
• When compressor is
stopped high-pressure
value quickly dropsby
approximately 196kPa (2.0
bar, 2
kg/cm
2,
28psi). It
then decreases gradually
thereafter.
Engine tendstooverheat.

AC359A
HA-27

ENGINECOMPARTMENT TROUBLE
DIAGNOSES
Harness Layout
RHA322F
HA-31
•

TROUBLEDIAGNOSES
Circuit Diagram -Air Conditioner
DUAL-PRESSURE
SWITCH
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HHA001
HA-34

TROUBLEDIAGNOSES
Circuit Diagram -Air Conditioner (Cont'd)

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HHA014

HA-35

TROUBLEDIAGNOSES
Wiring Diagram -
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HA-A/C-01

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(Foldout page).

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HHA002
HA-38