Nissan Maxima. Instruction — part 699
HA-22
< SYMPTOM DIAGNOSIS >
REFRIGERATION SYSTEM SYMPTOMS
WITH MONOCHROME DISPLAY
WITH MONOCHROME DISPLAY : Trouble Diagnoses for Abnormal Pressure
INFOID:0000000009465930
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 (usual) pressure range. Since the stan-
dard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air temperature-
to-operating pressure table).
Both High- and Low-pressure Sides are Too High
High-pressure Side is Too High and Low-pressure Side is Too Low
Magnet clutch does not engage.
Go to Trouble Diagnosis Procedure for Magnet Clutch.
Insufficient cooling
Go to Trouble Diagnosis Procedure for Insufficient Cooling.
No cool air comes out.
(Airflow volume is normal.)
Insufficient heating
Go to Trouble Diagnosis Procedure for Insufficient Heating.
No warm air comes out.
(Airflow volume is normal.)
Noise
Go to Trouble Diagnosis Procedure for Noise.
Memory function does not operate.
Go to Trouble Diagnosis Procedure for Memory Function.
Symptom
Reference
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Both high- and low-pressure sides
are too high.
Pressure is reduced soon af-
ter water is splashed on con-
denser.
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
if necessary.
• Low-pressure pipe is not
cold.
• When A/C compressor is
stopped high-pressure val-
ue quickly drops by approx-
imately 196 kPa (2 kg/cm
2
,
28 psi). It then decreases
gradually thereafter.
Poor heat exchange in con-
denser
(After A/C compressor opera-
tion stops, high-pressure de-
creases too slowly.)
↓
Air in refrigeration cycle
Evacuate and recharge system.
Engine tends to overheat.
Engine cooling systems mal-
function.
Check and repair engine cool-
ing 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 speci-
fication.
↓
Improper expansion valve ad-
justment
Replace expansion valve.
AC359A
REFRIGERATION SYSTEM SYMPTOMS
HA-23
< SYMPTOM DIAGNOSIS >
C
D
E
F
G
H
J
K
L
M
A
B
HA
N
O
P
High-pressure Side is Too Low and Low-pressure Side is Too High
Both High- and Low-pressure Sides are Too Low
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 A/C compres-
sor and condenser are clogged
or crushed.
• Check and repair or replace
malfunctioning parts.
• Check oil for contamination.
AC360A
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
High-pressure side is too low and
low-pressure side is too high.
High- and low-pressure sides
become equal soon after A/C
compressor operation stops.
A/C compressor pressure op-
eration is improper.
↓
Damaged inside A/C compres-
sor packings.
Replace A/C compressor.
No temperature difference be-
tween high- and low-pressure
sides.
A/C compressor pressure op-
eration is improper.
↓
Damaged inside A/C compres-
sor packings.
Replace A/C compressor.
AC356A
HA-24
< SYMPTOM DIAGNOSIS >
REFRIGERATION SYSTEM SYMPTOMS
Low-pressure Side Sometimes Becomes Negative
Low-pressure Side Becomes Negative
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Both high- and low-pressure sides
are too low.
• There is a big temperature
difference between liquid
tank outlet and inlet. Outlet
temperature is extremely
low.
• Liquid tank inlet and expan-
sion valve are frosted.
Liquid tank inside is slightly
clogged.
• Replace liquid tank.
• Check oil for contamination.
• Temperature of expansion
valve inlet is extremely low
as compared with areas
near liquid tank.
• Expansion valve inlet may
be frosted.
• Temperature difference oc-
curs somewhere in high-
pressure side.
High-pressure pipe located be-
tween liquid tank and expan-
sion valve is clogged.
• Check and repair malfunc-
tioning parts.
• Check oil for contamination.
Expansion valve and liquid
tank are warm or only cool
when touched.
Low refrigerant charge.
↓
Leaking fittings or compo-
nents.
Check refrigerant system for
leaks. Refer to
There is a big temperature dif-
ference between expansion
valve inlet and outlet while the
valve itself is frosted.
Expansion valve closes a little
compared with the specifica-
tion.
↓
1.
Improper expansion
valve adjustment.
2.
Malfunctioning expansion
valve.
3.
Outlet and inlet may be
clogged.
• Remove foreign particles by
using compressed air.
• Check oil for contamination.
An area of the low-pressure
pipe is colder than areas near
the evaporator outlet.
Low-pressure pipe is clogged
or crushed.
• Check and repair malfunc-
tioning parts.
• Check oil for contamination.
airflow volume is too low.
Evaporator is frozen.
• Check intake sensor circuit.
Refer to
• Repair evaporator fins.
• Replace evaporator.
• Refer to
.
AC353A
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Low-pressure side sometimes be-
comes negative.
• Air conditioning system does
not function and does not cy-
clically cool the compart-
ment air.
• The system constantly func-
tions for a certain period of
time after A/C compressor is
stopped and restarted.
Refrigerant does not discharge
cyclically.
↓
Moisture is frozen at expan-
sion valve outlet and inlet.
↓
Water is mixed with refrigerant.
• Drain water from refrigerant
or replace refrigerant.
• Replace liquid tank.
AC354A
REFRIGERATION SYSTEM SYMPTOMS
HA-25
< SYMPTOM DIAGNOSIS >
C
D
E
F
G
H
J
K
L
M
A
B
HA
N
O
P
WITH MONOCHROME DISPLAY : Symptom Matrix Chart
INFOID:0000000009465931
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Low-pressure side becomes nega-
tive.
Liquid tank or front/rear side of
expansion valve
′s pipe is frost-
ed 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 malfunction is caused by
water or foreign particles.
• If water is the cause, initially
cooling is okay. Then the wa-
ter freezes causing a block-
age. Drain water from
refrigerant or replace refrig-
erant.
• If due to foreign particles, re-
move expansion valve and
remove the particles with dry
and compressed air (not
shop air).
• If either of the above meth-
ods cannot correct the mal-
function, replace expansion
valve.
• Replace liquid tank.
• Check oil for contamination.
AC362A
Symptom
Reference
A/C system cannot be controlled
from the A/C switch assembly.
Go to Trouble Diagnosis Procedure for A/C System.
A/C display does not operate.
Go to Trouble Diagnosis Procedure for A/C display unit.
Air outlet does not change.
Go to Trouble Diagnosis Procedure for Mode Door Motor.
(LAN)
Mode door motor does not operate
normally.
Discharge air temperature does not
change.
Go to Trouble Diagnosis Procedure for Air Mix Door Motor.
(LAN)
(pas-
senger side)
Air mix door motor does not operate
normally.
Intake door does not change.
Go to Trouble Diagnosis Procedure for Intake Door Motor.
(LAN)
Intake door motor does not operate
normally.
Blower motor operation is malfunc-
tioning.
Go to Trouble Diagnosis Procedure for Blower Motor.
Magnet clutch does not engage.
Go to Trouble Diagnosis Procedure for Magnet Clutch.
Insufficient cooling
Go to Trouble Diagnosis Procedure for Insufficient Cooling.
No cool air comes out.
(Airflow volume is normal.)
Insufficient heating
Go to Trouble Diagnosis Procedure for Insufficient Heating.
No warm air comes out.
(Airflow volume is normal.)
Noise
Go to Trouble Diagnosis Procedure for Noise.
Memory function does not operate.
Go to Trouble Diagnosis Procedure for Memory Function.
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