Nissan Titan. Instruction — part 435
INSUFFICIENT COOLING
HAC-245
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
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9.
CHECK REFRIGERANT PURITY
1. Connect recovery/recycling equipment to vehicle.
2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant identifier.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Check contaminated refrigerant. Refer to
HAC-255, "Working with HFC-134a (R-134a)"
.
10.
CHECK FOR EVAPORATOR FREEZE UP
Start engine and run A/C. Check for evaporator freeze up.
Does evaporator freeze up?
YES
>> Perform performance test diagnoses. Refer to
HAC-245, "Diagnostic Work Flow"
.
NO
>> GO TO 11.
11.
CHECK REFRIGERANT PRESSURE
Check refrigerant pressure with manifold gauge connected. Refer to
Is the inspection result normal?
YES
>> Perform performance test diagnoses. Refer to
HAC-245, "Diagnostic Work Flow"
.
NO
>> GO TO 12.
12.
CHECK AIR DUCTS
Check ducts for air leaks.
Is the inspection result normal?
YES
>> System OK.
NO
>> Repair air leaks.
Diagnostic Work Flow
INFOID:0000000009882608
HAC-246
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
INSUFFICIENT COOLING
*1
HA-24, "Checking System for Leaks
Using the Fluorescent Dye Leak De-
tector"
*2
HA-33, "Removal and Installation"
*3
*4
HAC-248, "Trouble Diagnoses for
Abnormal Pressure"
*5
HAC-201, "Air Mix Door Motor Com-
ponent Function Check"
AWIIA0999GB
INSUFFICIENT COOLING
HAC-247
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
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Performance Chart
INFOID:0000000009882609
TEST CONDITION
Testing must be performed as follows:
*1
VTL-12, "Removal and Installation"
*2
HAC-211, "Front Blower Motor Com-
ponent Function Check"
*3
HA-33, "Removal and Installation"
*4
*5
HA-31, "Removal and Installation"
AWIIA1000GB
HAC-248
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
INSUFFICIENT COOLING
TEST READING
Recirculation-to-discharge Air Temperature Table
Ambient Air Temperature-to-operating Pressure Table
Trouble Diagnoses for Abnormal Pressure
INFOID:0000000009882610
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 control dial
(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)
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