Nissan Teana J32. Manual - part 645

 

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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

 

 

 

 

 

 

 

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