Infiniti QX4 (R50). Manual — part 479
PERFORMANCE TEST DIAGNOSES
NBHA0030
SHA893E
*5: HA-85
TROUBLE DIAGNOSES
Insufficient Cooling (Cont’d)
HA-114
RHA576H
*1: HA-149
*2: HA-95
*3: MA-13
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Insufficient Cooling (Cont’d)
HA-115
PERFORMANCE CHART
NBHA0031
Test Condition
NBHA0031S01
Testing must be performed as follows:
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
REC switch
(Recirculation) set
(blower) speed
Max. speed set
Engine speed
Idle speed
Operate the air conditioning system for 10 minutes before taking measurements.
Test Reading
NBHA0031S02
Recirculating-to-discharge Air Temperature Table
NBHA0031S0201
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)
6.0 - 9.0 (43 - 48)
30 (86)
10.0 - 13.6 (50 - 56)
35 (95)
15.2 - 19.5 (59 - 67)
40 (104)
22.5 - 27.1 (73 - 81)
60 - 70
25 (77)
9.0 - 12.2 (48 - 54)
30 (86)
13.6 - 17.2 (56 - 63)
35 (95)
19.5 - 23.7 (67 - 75)
40 (104)
27.1 - 32.3 (81 - 90)
Ambient Air Temperature-to-operating Pressure Table
NBHA0031S0202
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
25 (77)
1,226 - 1,638
(12.5 - 16.7, 178 - 237)
172 - 250 (1.75 - 2.55, 25 - 36)
30 (86)
1,422 - 1,883
(14.5 - 19.2, 206 - 273)
196 - 275 (2.0 - 2.8, 28 - 40)
35 (95)
1,657 - 2,187
(16.9 - 22.3, 240 - 317)
231 - 309 (2.35 - 3.15, 33 - 45)
40 (104)
1,922 - 2,501
(19.6 - 25.5, 279 - 363)
280 - 373 (2.85 - 3.8, 41 - 54)
TROUBLE DIAGNOSES FOR ABNORMAL PRESSURE
NBHA0032
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, however, differs from vehicle to vehicle, refer to HA-116 (“Ambient air temperature-
to-operating pressure table”).
TROUBLE DIAGNOSES
Insufficient Cooling (Cont’d)
HA-116
Both High- and Low-pressure Sides are Too High.
NBHA0032S01
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Both high- and low-pressure sides
are too high.
AC359A
I
Pressure is reduced soon
after water is splashed on
condenser.
Excessive refrigerant charge
in refrigeration cycle
Reduce refrigerant until
specified pressure is
obtained.
Air suction by cooling fan is
insufficient.
Insufficient condenser cool-
ing performance
"
1. Condenser fins are
clogged.
2. Improper fan rotation of
cooling fan
I
Clean condenser.
I
Check and repair cooling
fan as necessary.
I
Low-pressure pipe is not
cold.
I
When compressor is
stopped high-pressure
value quickly drops by
approximately 196 kPa (2
kg/cm
2
, 28 psi). It then
decreases gradually there-
after.
Poor heat exchange in con-
denser
(After compressor operation
stops, high pressure
decreases too slowly.)
"
Air in refrigeration cycle
Evacuate repeatedly and
recharge system.
Engine tends to overheat.
Engine cooling systems mal-
function.
Check and repair each
engine cooling system.
I
An area of the low-pres-
sure pipe is colder than
areas near the evaporator
outlet.
I
Plates are sometimes cov-
ered with frost.
I
Excessive liquid refrigerant
on low-pressure side
I
Excessive refrigerant dis-
charge flow
I
Expansion valve is open a
little compared with the
specification.
"
1. Improper thermal valve
installation
2. Improper expansion valve
adjustment
Replace expansion valve.
High-pressure Side is Too High and Low-pressure Side is Too Low.
NBHA0032S02
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
High-pressure side is too high and
low-pressure side is too low.
AC360A
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.
I
Check and repair or
replace malfunctioning
parts.
I
Check lubricant for con-
tamination.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Insufficient Cooling (Cont’d)
HA-117
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