Infiniti G20 (P11). Manual — part 464
High-pressure Side is Too Low and Low-pressure Side is Too High.
NCHA0151S03
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.
Both High- and Low-pressure Sides are Too Low.
NCHA0151S04
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-204.
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.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
MANUAL
Insufficient Cooling (Cont’d)
HA-187
Low-pressure Side Sometimes Becomes Negative.
NCHA0151S05
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.
NCHA0151S06
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 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
MANUAL
Insufficient Cooling (Cont’d)
HA-188
Insufficient Heating
TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT HEATING
=NCHA0152
SYMPTOM: Insufficient heating.
INSPECTION FLOW
RHA537H
*1: HA-166
*2: HA-162
*3: HA-148
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
MANUAL
Insufficient Heating
HA-189
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