2005 NISSAN NAVARA Repair Workshop Manual

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Page 2473 of 3171

NISSAN NAVARA 2005 Repair Workshop Manual MTC-86
TROUBLE DIAGNOSIS
Insufficient Cooling
EJS005GM
SYMPTOM: Insufficient cooling
INSPECTION FLOW
*1 .MTC-53, "Operational Check".*2MTC-51, "A/C System Self-diagno-
sis Function".*3MTC-52, "
SELF-D

Page 2474 of 3171

NISSAN NAVARA 2005 Repair Workshop Manual TROUBLE DIAGNOSIS
MTC-87
C
D
E
F
G
H
I
K
L
MA
B
MTC
PERFORMANCE TEST DIAGNOSES
*1MTC-89, "PERFORMANCE
CHART".*2MTC-89, "
PERFORMANCE
CHART".*3MTC-90, "
TROUBLE DIAGNOSES
FOR UNUSUAL PRESSURE".
*4MTC-6

Page 2475 of 3171

NISSAN NAVARA 2005 Repair Workshop Manual MTC-88
TROUBLE DIAGNOSIS
*1MTC-123, "Removal and Installation
for Compressor Clutch".*2MTC-71, "
Blower Motor Circuit".*3EM-12, "Checking Drive Belts".
WJIA0361E

Page 2476 of 3171

NISSAN NAVARA 2005 Repair Workshop Manual TROUBLE DIAGNOSIS
MTC-89
C
D
E
F
G
H
I
K
L
MA
B
MTC
PERFORMANCE CHART
Test Condition
Testing must be performed as follows:
Test Reading
Recirculating-to-discharge Air Temperature Table
Ambient Air Tem

Page 2477 of 3171

NISSAN NAVARA 2005 Repair Workshop Manual MTC-90
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSES FOR UNUSUAL PRESSURE
Whenever system¢s high and/or low side pressure is unusual, diagnose using a manifold gauge. The marker
above the gauge scale in the fo

MTC-90
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSES FOR UNUSUAL PRESSURE
Whenever system¢s high and/or low side pressure is unusual, diagnose using a manifold gauge. The marker
above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the stan-
dard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air temperature-
to-operating pressure table).
Both High- and Low-pressure Sides are Too High
High-pressure Side is Too High and Low-pressure Side is Too Low
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure sides
are too high.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
lClean condenser.
lCheck and repair cooling fan
as necessary.
lLow-pressure pipe is not
cold.
lWhen compressor is
stopped high-pressure
value quickly drops by
approximately 196 kPa (2
kg/cm
2,28psi).Itthen
decreases gradually there-
after.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 engine cool-
ing system.
lAn area of the low-pres-
sure pipe is colder than
areas near the evaporator
outlet.
lPlates are sometimes cov-
ered with frost.
lExcessive liquid refrigerant
on low-pressure side
lExcessive refrigerant dis-
charge flow
lExpansion valve is open a
littlecomparedwiththe
specification.
¯
Improper expansion valve
adjustmentReplace expansion valve.
AC359A
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too high and
low-pressure side is too low.
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.
lCheck and repair or replace
malfunctioning parts.
lCheck lubricant for contami-
nation.
AC360A

Page 2478 of 3171

NISSAN NAVARA 2005 Repair Workshop Manual TROUBLE DIAGNOSIS
MTC-91
C
D
E
F
G
H
I
K
L
MA
B
MTC
High-pressure Side is Too Low and Low-pressure Side is Too High
Both High- and Low-pressure Sides are Too Low
Gauge indication Refrigerant cycle Pro

TROUBLE DIAGNOSIS
MTC-91
C
D
E
F
G
H
I
K
L
MA
B
MTC
High-pressure Side is Too Low and Low-pressure Side is Too High
Both High- and Low-pressure Sides are Too Low
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too low and
low-pressure side is too high.High- and low-pressure sides
become equal soon after com-
pressor operation stops.Compressor pressure opera-
tion is improper.
¯
Damaged inside compressor
packings.Replace compressor.
No temperature difference
between high- and low-pres-
sure sides.Compressor pressure opera-
tion is improper.
¯
Damaged inside compressor
packings.Replace compressor.
AC356A
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure sides
are too low.
lThere is a big temperature
difference between receiver
drier outlet and inlet. Outlet
temperature is extremely
low.
lLiquid tank inlet and expan-
sion valve are frosted.Liquid tank inside is slightly
clogged.
lReplace liquid tank.
lCheck lubricant for contami-
nation.
lTemperature of expansion
valve inlet is extremely low
as compared with areas
near liquid tank.
lExpansion valve inlet may
be frosted.
lTemperature difference
occurs somewhere in high-
pressure side.High-pressure pipe located
between receiver drier and
expansion valve is clogged.
lCheck and repair malfunc-
tioning parts.
lCheck lubricant for contami-
nation.
Expansion valve and liquid
tank are warm or only cool
when touched.Low refrigerant charge.
¯
Leaking fittings or compo-
nents.Check refrigerant system for
leaks. Refer toMTC-131,
"Checking for Refrigerant
Leaks"
There is a big temperature dif-
ference between expansion
valve inlet and outlet while the
valve itself is frosted.Expansion valve closes a little
compared with the specifica-
tion.
¯
1. Improper expansion valve
adjustment.
2. Malfunctioning expansion
valve.
3. Outlet and inlet may be
clogged.lRemove foreign particles by
using compressed air.
lCheck lubricant for contami-
nation.
An area of the low-pressure
pipe is colder than areas near
the evaporator outlet.Low-pressure pipe is clogged
or crushed.
lCheck and repair malfunc-
tioning parts.
lCheck lubricant for contami-
nation.
Air flow volume is too low. Evaporator is frozen.
lCheck intake sensor circuit.
Refer toMTC-95, "
Intake
Sensor Circuit".
lReplace compressor.
AC353A

Page 2479 of 3171

NISSAN NAVARA 2005 Repair Workshop Manual MTC-92
TROUBLE DIAGNOSIS
Low-pressure Side Sometimes Becomes Negative
Low-pressure Side Becomes Negative
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side sometimes

Page 2480 of 3171

NISSAN NAVARA 2005 Repair Workshop Manual TROUBLE DIAGNOSIS
MTC-93
C
D
E
F
G
H
I
K
L
MA
B
MTC
Insufficient HeatingEJS005GN
SYMPTOM: Insufficient heating
INSPECTION FLOW
*1 .MTC-53, "Operational Check".*2MTC-63, "Air Mix Door Motor Cir-
cuit".

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