Nissan Titan. Instruction — part 416
INSUFFICIENT COOLING
HAC-169
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
*1
HA-24, "Checking System for Leaks
Using the Fluorescent Dye Leak De-
tector"
*2
HA-33, "Removal and Installation"
*3
*4
HAC-171, "Trouble Diagnoses for
Abnormal Pressure"
*5
HAC-120, "Air Mix Door Motor Com-
ponent Function Check"
AWIIA0999GB
HAC-170
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
INSUFFICIENT COOLING
Performance Chart
INFOID:0000000009882553
TEST CONDITION
Testing must be performed as follows:
*1
VTL-12, "Removal and Installation"
*2
HAC-131, "Front Blower Motor Com-
ponent Function Check"
*3
HA-33, "Removal and Installation"
*4
*5
HA-33, "Removal and Installation"
AWIIA1000GB
INSUFFICIENT COOLING
HAC-171
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
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A
B
HAC
N
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TEST READING
Recirculating-to-discharge Air Temperature Table
Ambient Air Temperature-to-operating Pressure Table
Trouble Diagnoses for Abnormal Pressure
INFOID:0000000009882554
Whenever system
′s high and/or low side pressure is abnormal, diagnose using a manifold gauge. The marker
above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the stan-
Vehicle location
Indoors or in the shade (in a well-ventilated place)
Doors
Closed
Door window
Open
Hood
Open
TEMP.
Max. COLD
Mode switch
(Ventilation) set
Recirculation (REC) switch
(Recirculation) set
Blower speed
Max. speed set
Engine speed
Idle speed
Operate the air conditioning system for 10 minutes before taking measurements.
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature at center ventilator
°C (°F)
Relative humidity
%
Air temperature
°C (°F)
50 - 60
20 (68)
9.9 - 13.9 (50 - 57)
25 (77)
14.6 - 18.6 (58 - 65)
30 (86)
16.8 - 21.8 (62 - 71)
35 (95)
21.1 - 27.1 (70 - 81)
40 (104)
25.3 - 31.5 (78 - 89)
60 - 70
20 (68)
11.4 - 15.2 (53 - 59)
25 (77)
15.5 - 20.0 (60 - 68)
30 (86)
19.9 - 25.0 (68 - 77)
35 (95)
24.5 - 29.6 (76 - 85)
40 (104)
28.7 - 34.9 (84 - 95)
Ambient air
High-pressure (Discharge side)
kPa (kg/cm
2
, psi)
Low-pressure (Suction side)
kPa (kg/cm
2
, psi)
Relative humidity
%
Air temperature
°C (°F)
50 - 70
20 (68)
1020 - 1250
(10.4 - 12.7, 147.9 - 181.3)
160 - 190
(1.63 - 1.94, 23.2 - 27.6)
25 (77)
1236 - 1510
(12.6 - 15.4, 179.2 - 219)
206 - 245
(2.1 - 2.5, 29.9 - 35.6)
30 (86)
1569 - 1,922
(16.0 - 19.6, 227.6 - 278.8)
265 - 324
(2.7 - 3.3, 38.4 - 46.9)
35 (95)
1,697 - 2079
(17.3 - 21.2, 246.1 - 301.5)
304 - 363
(3.1 - 3.7, 44.1 - 52.6)
40 (104)
1971 - 2403
(20.1 - 24.5, 285.9 - 348.5)
373 - 451
(3.8 - 4.6, 54.0 - 65.4)
HAC-172
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
INSUFFICIENT COOLING
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
High-pressure Side is Too Low and Low-pressure Side is Too High
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Both high- and low-pressure sides
are too high.
Pressure is reduced soon af-
ter water is splashed on con-
denser.
Excessive refrigerant charge in
refrigeration cycle
Reduce refrigerant until speci-
fied pressure is obtained.
Air suction by cooling fan is in-
sufficient.
Insufficient condenser cooling
performance
↓
1.
Condenser fins are
clogged.
2.
Improper fan rotation of
cooling fan
• Clean condenser.
• Check and repair cooling fan
if necessary.
• Low-pressure pipe is not
cold.
• When compressor is
stopped high-pressure val-
ue quickly drops by approx-
imately 196 kPa (2 kg/cm
2
,
28 psi). It then decreases
gradually thereafter.
Poor heat exchange in con-
denser
(After compressor operation
stops, high-pressure decreas-
es too slowly.)
↓
Air in refrigeration cycle
Evacuate and recharge system.
Engine tends to overheat.
Engine cooling systems mal-
function.
Check and repair engine cool-
ing system.
• An area of the low-pressure
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 lit-
tle compared with the speci-
fication.
↓
Improper expansion valve ad-
justment
Replace 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 lo-
cated between compressor
and condenser are clogged or
crushed.
• Check and repair or replace
malfunctioning parts.
• Check oil for contamination.
AC360A
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