Nissan Teana J32. Manual - part 645

HA-8

< SYMPTOM DIAGNOSIS >

REFRIGERATION SYSTEM SYMPTOMS

SYMPTOM DIAGNOSIS

REFRIGERATION SYSTEM SYMPTOMS

Trouble Diagnosis For Unusual Pressure

INFOID:0000000003795806

Diagnose using a manifold gauge whenever the system’s high and/or low side pressure(s) is/are unusual. The
marker above the gauge scale in the following tables indicates the standard pressure range. Refer to the
above table (Ambient air temperature-to-operating pressure table) since the standard pressure, however, dif-
fers from vehicle to vehicle.

Symptom Table

INFOID:0000000003795807

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

Both high and low-pressure sides 
are too high.

The pressure returns to nor-
mal and is reduced soon after 
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 the compressor is 

stopped the high-pressure 
reading quickly drops by 
approximately 196 kPa 

(1.96 bar, 2 kg/cm

2

, 28 psi). 

It then decreases gradually 
thereafter.

Poor heat exchange in con-
denser
(After compressor operation 
stops, high-pressure decreas-
es too slowly).

↓

Air in refrigeration cycle.

Evacuate repeatedly and re-
charge system.

Engine tends to overheat.

Engine cooling systems mal-
function.

Check and repair each engine 
cooling system.

• An area of the low-pressure 

pipe is colder than areas 
near the evaporator outlet.

• Low-pressure pipe is some-

times covered with frost.

• Excessive liquid refrigerant 

on low-pressure side.

• Excessive refrigerant dis-

charge flow.

• Expansion valve is slightly 

open compared with the 
specification.

↓

Improper expansion valve ad-
justment.

Replace expansion valve.

High-pressure side is too high and 
low-pressure side is too low.

Upper side of condenser and 
high-pressure side are hot, 
however, the liquid tank is not 
very hot.

High-pressure tube or parts lo-
cated between compressor 
and condenser are clogged or 
crushed.

• Check and repair or replace 

malfunctioning parts.

• Check lubricant for contami-

nation.

AC359A

AC360A

REFRIGERATION SYSTEM SYMPTOMS

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High-pressure side is too low and 
low-pressure side is too high.

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 be-
tween high- and low-pressure 
sides.

Compressor pressure opera-
tion is improper.

↓

Damaged inside compressor 
packings.

Replace compressor.

Both high and low-pressure sides 
are too low.

• There is a big temperature 

difference between the liq-
uid tank outlet and inlet. 
Outlet temperature is ex-
tremely low.

• Liquid tank inlet and expan-

sion valve are frosted.

Liquid tank inside is slightly 
clogged.

• Replace liquid tank.
• Check lubricant for contami-

nation.

•  Expansion valve inlet tem-

perature is extremely low 
compared with areas near 
the liquid tank.

• Expansion valve inlet is 

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 lubricant for contami-

nation.

Expansion valve and liquid 
tank are warm or slightly cool 
when touched.

Low refrigerant charge.

↓

Leaking fittings or components.

Check refrigerant for leakages. 
Refer to 

HA-31, "Refrigerant 

Leakages"

.

There is a big temperature dif-
ference between the expan-
sion valve inlet and outlet 
while the valve itself is frost-
ed.

Expansion valve slightly closes 
compared with the specifica-
tion.

↓

1.

Improper expansion 
valve adjustment.

2.

Malfunctioning expansion 
valve.

3.

Outlet and inlet may be 
clogged.

• Remove foreign materials by 

using compressed air.

• Replace expansion valve.
• Check lubricant for contami-

nation.

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 lubricant for contami-

nation.

Air flow volume is not suffi-
cient or is too low.

Evaporator is frozen.

• Check intake sensor circuit.

Refer to 

HAC-50, "Diagnosis 

Procedure"

(WITHOUT 7 

INCH DISPLAY) or 

HAC-172, 

"Diagnosis Proce-
dure"

(WITH 7 INCH DIS-

PLAY).

• Replace compressor.
• Repair evaporator fins.
• Replace evaporator.
• Check blower motor circuit. 

Refer to 

HAC-68, "Diagnosis 

Procedure"

(WITHOUT 7 

INCH DISPLAY) or 

HAC-193, 

"Diagnosis Proce-
dure"

(WITH 7 INCH DIS-

PLAY).

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

AC356A

AC353A

HA-10

< SYMPTOM DIAGNOSIS >

REFRIGERATION SYSTEM SYMPTOMS

Low-pressure side sometimes be-
comes negative.

• Air conditioning system 

does not function and does 
not cyclically cool the com-
partment air.

• The system constantly 

functions for a period of 
time after compressor is 
stopped and restarted.

Refrigerant does not discharge 
cyclically.

↓

Moisture is frozen at expansion 
valve outlet and inlet.

↓

Water is mixed with refrigerant.

• Drain water from refrigerant 

or replace refrigerant.

• Replace liquid tank.

Low-pressure side becomes nega-
tive.

Liquid tank or front/rear side 
of expansion valve’s pipe is 
frosted or wet with dew.

High-pressure side is closed 
and refrigerant does not flow.

↓

Expansion valve or liquid tank 
is frosted.

Do not use the system until the 
frost has melted. Start it again to 
check whether or not the mal-
function is caused by water or 
foreign materials.
• Cooling is initially okay if wa-

ter is the cause. Then the wa-
ter freezes, which causes a 
blockage. Drain water from 
refrigerant or replace refriger-
ant.

• If due to foreign materials, re-

move expansion valve and 
the particles with dry com-
pressed air (not shop air.)

• Replace expansion valve if 

either of the above methods 
cannot correct the malfunc-
tion.

• Replace liquid tank.
• Check lubricant for contami-

nation.

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

AC354A

AC362A

COMPRESSOR SYSTEM SYMPTOMS

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COMPRESSOR SYSTEM SYMPTOMS

Symptom Table

INFOID:0000000003795808

Follow the next table and perform trouble diagnosis if there is a compressor unit malfunction (internal noise,
insufficient cooling).

*1: First conduct inspection according to trouble diagnosis for each malfunction. Refer to 

HAC-88, "Inspection

procedure"

.

*2: Applicable to variable capacity compressor only.

Symptom

Inspection method

Check list

Result

Action

Noise from compressor unit 
When A/C is ON.
(rattling or rolling sound)

Cooker system in-
ternal pressure

Check with manifold gauge

Both high- and low-
pressure sides are 

high.

*2

Recharge with proper 
amount of refrigerant.

High/low-pressures 

hunt.

*2

Replace compressor 
only.

Check compressor 
oil condition.

Sample compressor oil and 
judge.

Refer to the criteria 
shown in compressor 
lubricant.

Diagnostic result 1: 
Replace compressor 
only.

Diagnostic result 2: 
Replace compressor 
and liquid tank.

Insufficient cooling

*1

Compressor body

Check rotation of compressor. 
If sized or stuck, sample com-
pressor oil and judge.

Cooler system inter-
nal pressure

Check with a manifold gauge. 
Sample compressor oil and 
judge if the difference between 
high-pressure and low-pres-
sure is small or if they are al-
most the same.

Outlet air temperature rises 

temporarily while driving.

*2

—

—

—

Replace compressor 
only.

JSIIA0927GB