Infiniti QX4 (R50). Manual — part 480
High-pressure Side is Too Low and Low-pressure Side is Too High.
NBHA0032S03
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.
TROUBLE DIAGNOSES
Insufficient Cooling (Cont’d)
HA-118
Both High- and Low-pressure Sides are Too Low.
NBHA0032S04
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.
Compressor discharge
capacity does not change.
(Compressor stroke is set at
maximum.)
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 Refriger-
ant Leaks”, HA-155.
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.
"
Compressor discharge
capacity does not change.
(Compressor stroke is set at
maximum length.)
Replace compressor.
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-119
Low-pressure Side Sometimes Becomes Negative.
NBHA0032S05
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.
Low-pressure Side Becomes Negative.
NBHA0032S06
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Low-pressure side becomes nega-
tive.
AC362A
Liquid tank or front/rear side
of expansion valve’s pipe is
frosted or dewed.
High-pressure side is closed
and refrigerant does not flow.
"
Expansion valve or liquid
tank is frosted.
Leave the system at rest
until no frost is present. Start
it again to check whether or
not the problem is caused by
water or foreign particles.
I
If water is the cause, ini-
tially cooling is okay. Then
the water freezes causing
a blockage. Drain water
from refrigerant or replace
refrigerant.
I
If due to foreign particles,
remove expansion valve
and remove the particles
with dry and compressed
air (not shop air).
I
If either of the above
methods cannot correct
the problem, replace
expansion valve.
I
Replace liquid tank.
I
Check lubricant for con-
tamination.
TROUBLE DIAGNOSES
Insufficient Cooling (Cont’d)
HA-120
Insufficient Heating
TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT HEATING
=NBHA0097
SYMPTOM:
I
Insufficient heating
Inspection Flow
NBHA0097S01
Without Navigation System
NBHA0097S0101
SHA894EA
*1: HA-66
*2: HA-44
*3: HA-45
*4: HA-45
*5: HA-85
*6: STEP-BY-STEP PROCEDURE
(HA-45), see No. 13.
*10: HA-82
*11: MA-14
*12: LC-11
*13: LC-16
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Insufficient Heating
HA-121
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