Nissan Altima L32. Instruction — part 846
HAC-158
< SYMPTOM DIAGNOSIS >
[MANUAL AIR CONDITIONER]
INSUFFICIENT COOLING
*1
HA-27, "Checking System for Leaks
Using the Fluorescent Leak Detector"
*2
HA-35, "Removal and Installation for
Compressor - QR25DE Models"
or
HA-36, "Removal and Installation for
Compressor - VQ35DE Models"
*3
HAC-122, "Diagnosis Procedure"
*4
HAC-160, "Trouble Diagnosis For
Abnormal Pressure"
*5
HAC-122, "Diagnosis Procedure"
AWIIA0999GB
INSUFFICIENT COOLING
HAC-159
< SYMPTOM DIAGNOSIS >
[MANUAL AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Performance Chart
INFOID:0000000004498291
TEST CONDITION
Testing must be performed as follows:
*1
VTL-15, "Removal and Installation"
*2
HAC-127, "Diagnosis Procedure"
*3
HAC-131, "Diagnosis Procedure"
*4
(QR25DE) or
EM-121, "Checking Drive Belts"
(VQ35DE)
*5
HA-35, "Removal and Installation for
Compressor - QR25DE Models"
or
HA-36, "Removal and Installation for
Compressor - VQ35DE Models"
AWIIA1240GB
HAC-160
< SYMPTOM DIAGNOSIS >
[MANUAL AIR CONDITIONER]
INSUFFICIENT COOLING
TEST READING
Recirculating-to-discharge Air Temperature Table
Ambient Air Temperature-to-operating Pressure Table
Trouble Diagnosis For Abnormal Pressure
INFOID:0000000004498292
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 (normal) pressure range. Since the stan-
dard (normal) pressure differs from vehicle to vehicle, refer to Ambient Air Temperature-to-operating Pressure
Table above.
Both High- and Low-pressure Sides are Too High
Vehicle location
Indoors or in the shade (in a well-ventilated place)
Doors
Closed
Door windows
Open
Hood
Open
TEMP.
Max. COLD
Mode switch
(Ventilation) set
Intake 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
25 (77)
10.0 - 12.3 (50 - 54)
30 (86)
13.2 - 15.3 (56 - 60)
35 (95)
17.2 - 21.0 (63 - 70)
60 - 70
25 (77)
12.3 - 14.9 (54 - 59)
30 (86)
15.3 - 19.3 (60 - 67)
35 (95)
21.0 - 24.4 (70 - 76)
Ambient air
High-pressure (Discharge side)
kPa (kg/cm2, psi)
Low-pressure (Suction side)
kPa (kg/cm2, psi)
Relative humidity
%
Air temperature
°C (°F)
50 - 70
30 (86)
1,220 - 1,500
(12.44 - 15.30, 176.9 - 217.5)
240 - 295
(2.45 - 3.01, 34.8 - 42.8)
35 (95)
1,360 - 1,690
(13.87 - 17.24, 197.2 - 245.1)
275 - 335
(2.81 - 3.42, 39.9 - 48.6)
40 (104)
1,500 - 1,830
(12.44 - 18.67, 176.9 - 265.4)
310 - 375
(3.16 - 3.83, 45.0 - 54.4)
INSUFFICIENT COOLING
HAC-161
< SYMPTOM DIAGNOSIS >
[MANUAL AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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 after
water is splashed on condens-
er.
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
as necessary.
• Low-pressure pipe is not
cold.
• When compressor is stopped
high-pressure value quickly
drops by approximately 196
kPa (2 kg/cm
2
, 28 psi). It then
decreases gradually thereaf-
ter.
Poor heat exchange in con-
denser
(After compressor operation
stops, high pressure decreases
too slowly.)
↓
Air in refrigeration cycle
Evacuate and recharge system.
Engine tends to overheat.
Engine cooling systems mal-
function.
Check and repair each engine
cooling 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 specifi-
cation.
↓
1.
Improper thermal valve in-
stallation
2.
Improper expansion valve
adjustment
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 lubricant for contami-
nation.
AC360A
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