Infiniti G20 (P11). Manual — part 438
PERFORMANCE CHART
NCHA0031
Test Condition
NCHA0031S01
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
NCHA0031S02
Recirculating-to-discharge Air Temperature Table
NCHA0031S0201
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)
10.9 - 12.9 (52 - 55)
30 (86)
15.2 - 17.7 (59 - 64)
35 (95)
19.4 - 22.5 (67 - 73)
60 - 70
25 (77)
12.9 - 15.0 (55 - 59)
30 (86)
17.7 - 20.5 (64 - 69)
35 (95)
22.5 - 25.2 (73 - 77)
Ambient Air Temperature-to-operating Pressure Table
NCHA0031S0202
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
30 (86)
1,177 - 1,422
(12.0 - 14.5, 171 - 206)
216 - 255 (2.2 - 2.6, 31 - 37)
35 (95)
1,344 - 1,648
(13.7 - 16.8, 195 - 239)
255 - 314 (2.6 - 3.2, 37 - 46)
40 (104)
1,471 - 1,785
(15.0 - 18.2, 213 - 259)
304 - 382 (3.1 - 3.9, 44 - 55)
TROUBLE DIAGNOSES FOR ABNORMAL PRESSURE
NCHA0032
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) pres-
sure range. Since the standard (normal) pressure, however, differs
from vehicle to vehicle, refer to HA-83 (“Ambient air temperature-
to-operating pressure table”).
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
AUTO
Insufficient Cooling (Cont’d)
HA-83
Both High and Low-pressure Sides are Too High.
NCHA0032S01
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.
NCHA0032S02
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.
TROUBLE DIAGNOSES
AUTO
Insufficient Cooling (Cont’d)
HA-84
High-pressure Side is Too Low and Low-pressure Side
is Too High.
NCHA0032S03
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
High-pressure side is too low and
low-pressure side is too high.
AC356A
High and low-pressure sides
become equal soon after
compressor 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.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
AUTO
Insufficient Cooling (Cont’d)
HA-85
Both High- and Low-pressure Sides are Too Low.
NCHA0032S04
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Both high- and low-pressure sides
are too low.
AC353A
I
There is a big temperature
difference between
receiver drier outlet and
inlet. Outlet temperature is
extremely low.
I
Liquid tank inlet and
expansion valve are
frosted.
Liquid tank inside is slightly
clogged.
I
Replace liquid tank.
I
Check lubricant for con-
tamination.
I
Temperature of expansion
valve inlet is extremely low
as compared with areas
near liquid tank.
I
Expansion valve inlet may
be frosted.
I
Temperature difference
occurs somewhere in high-
pressure side
High-pressure pipe located
between receiver drier and
expansion valve is clogged.
I
Check and repair malfunc-
tioning parts.
I
Check lubricant for con-
tamination.
I
Expansion valve and liquid
tank are warm or only cool
when touched.
Low refrigerant charge
"
Leaking fittings or compo-
nents
Check refrigerant for leaks.
Refer to “Checking for
Refrigerant Leaks”, HA-118.
There is a big temperature
difference between expan-
sion valve inlet and outlet
while the valve itself is
frosted.
Expansion valve closes a
little compared with the
specification.
"
1. Improper expansion valve
adjustment
2. Malfunctioning thermal
valve
3. Outlet and inlet may be
clogged.
I
Remove foreign particles
by using compressed air.
I
Check lubricant for con-
tamination.
An area of the low-pressure
pipe is colder than areas
near the evaporator outlet.
Low-pressure pipe is clogged
or crushed.
I
Check and repair malfunc-
tioning parts.
I
Check lubricant for con-
tamination.
Air flow volume is not
enough or is too low.
Evaporator is frozen.
I
Check thermo control
amp. operation.
I
Replace compressor.
Low-pressure Side Sometimes Becomes Negative.
NCHA0032S05
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Low-pressure side sometimes
becomes negative.
AC354A
I
Air conditioning system
does not function and
does not cyclically cool the
compartment air.
I
The system constantly
functions for a certain
period of time after com-
pressor is stopped and
restarted.
Refrigerant does not dis-
charge cyclically.
"
Moisture is frozen at expan-
sion valve outlet and inlet.
"
Water is mixed with refriger-
ant.
I
Drain water from refriger-
ant or replace refrigerant.
I
Replace liquid tank.
TROUBLE DIAGNOSES
AUTO
Insufficient Cooling (Cont’d)
HA-86
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