Nissan Versa Note. Manual - part 486

HA-14

< SYMPTOM DIAGNOSIS >

REFRIGERATION SYSTEM SYMPTOMS

SYMPTOM DIAGNOSIS

REFRIGERATION SYSTEM SYMPTOMS

Trouble Diagnosis For Unusual Pressure

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Diagnose using a manifold gauge set whenever refrigerant pressures are unusual. The marker above the

gauge scale in the following table indicates the standard (usual) pressure range. Refer to 

HA-23, "Inspection"

.

Symptom Table

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Gauge indication

Refrigerant cycle

Probable cause

Corrective action

Both high and low-pressure sides 
are too high.

The pressure returns to nor-
mal soon after sprinkling wa-
ter on condenser.

Overfilled refrigerant.

Recover refrigerant, evacuate 
system, and recharge with the 
specified amount of refrigerant. 
Refer to 

HA-19, "Recycle Re-

frigerant"

.

Air flow to condenser is insuf-
ficient.

Insufficient condenser cooling 
performance.
• Poor cooling fan rotation.
• Missing and/or improper in-

stallation of air guides.

• Clogged or dirty condenser 

fins.

• Repair or replace malfunc-

tioning parts.

• Clean and/or repair condens-

er fins.

When compressor stops, 
high-pressure gauge quickly 
drops by approximately 196 
kPa (2 kg/cm

2

, 28 psi), then 

gradually decreases.

Air mixed with refrigerant.

Recover refrigerant, evacuate 
system, and recharge with the 
specified amount of refrigerant. 
Refer to 

HA-19, "Recycle Re-

frigerant"

.

• Low-pressure pipe is cooler 

than the outlet of evapora-
tor.

• Low-pressure pipe is frost-

ed.

Expansion valve opened too 
much (excessive flow of refrig-
erant).

Replace expansion valve. Refer 
to 

HA-33, "EXPANSION VALVE 

: Removal and Installation"

.

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

High-pressure pipe and upper 
side of condenser become 
hot, however, liquid tank does 
not become so hot.

Clogged or crushed high-pres-
sure pipe located between 
compressor and condenser.

Repair or replace the malfunc-
tioning parts.

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

• The readings of both sides 

become equal soon after 
compressor stops.

• There is no temperature dif-

ference between high and 
low-pressure sides.

Malfunctioning compressor (in-
sufficient compressor pressure 
operation).
• Damaged or broken of inter-

nal components.

• Malfunctioning gaskets.

Replace compressor. Refer to 

HA-25, "Removal and Installa-
tion"

.

AC359A

AC360A

AC356A

REFRIGERATION SYSTEM SYMPTOMS

HA-15

< SYMPTOM DIAGNOSIS >

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Both high and low-pressure sides 
are too low.

• The area around evapora-

tor outlet does not become 
cold.

• The area around evapora-

tor inlet becomes frosted.

Clogged expansion valve.
• Breakage of temperature 

sensor.

• Clogging by foreign material.

Eliminate foreign material from 
expansion valve, or replace it.

• There is a temperature dif-

ference between the areas 
around outlet and inlet 
pipes of liquid tank.

• Liquid tank becomes frost-

ed.

Malfunction inside liquid tank 
(clogged strainer).

Replace condenser (includes 
liquid tank). Refer to 

HA-29, 

"CONDENSER : Removal and 
Installation"

.

Evaporator becomes frosted.

Clogged or crushed low-pres-
sure pipe.

Repair or replace malfunction-
ing parts.

Malfunctioning thermo amp.

Check thermo amp. system. 
Refer to 

HAC-11, "Component 

Parts Location"

.

There is a small temperature 
difference between the high 
and low pressure pipes.

• Low refrigerant charge.
• Leak or leaks in A/C system.

• Check for leaks. Refer to 

HA-

17, "Leak Test"

.

• Recover refrigerant, evacu-

ate system, and recharge 
with the specified amount of 
refrigerant. Refer to 

HA-19, 

"Recycle Refrigerant"

.

Low-pressure side sometimes be-
comes negative.

• Sometimes the area 

around evaporator outlet 
does not become cold.

• Sometimes the area 

around evaporator inlet is 
frosted.

• Icing caused by moisture 

mixed with refrigerant.

• Deteriorated dryer material 

in liquid tank.

Recover refrigerant then re-
place condenser (includes liq-
uid tank). Refer to 

HA-29, 

"CONDENSER : Removal and 
Installation"

. Evacuate system 

and recharge with the specified 
amount of refrigerant. Refer to 

HA-19, "Charge Refrigerant"

.

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

AC353A

AC354A

HA-16

< SYMPTOM DIAGNOSIS >

NOISE

NOISE

Symptom Table

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Symptom

Noise source

Probable cause

Corrective action

Unusual noise from compressor 
when A/C is ON.

Inside of compressor

Worn, broken, or clogged internal com-
ponents.

Check compressor oil. Re-
fer to 

HA-21, "Inspection"

.

Magnet clutch

Contact of clutch disc with pulley.

Check clearance between 
clutch disc and pulley. Refer 
to 

HA-25, "Inspection"

.

Compressor body

Loose compressor mounting bolts.

Check torque of mounting 
bolts. Refer to 

HA-25, "Ex-

ploded View"

.

Unusual noise from cooler piping.

Cooler piping (pipe and 
flexible hose)

Loose or improper installation of clip 
and bracket.

Check installation of cooler 
piping. Refer to 

HA-27, "Ex-

ploded View"

. 

Unusual noise from expansion 
valve when A/C is ON.

Expansion valve

Low refrigerant charge.

• Check for leaks. Refer to 

HA-17, "Leak Test"

.

• Recover refrigerant, 

evacuate system, and re-
charge with the specified 
amount of refrigerant.

Worn, broken, or clogged internal com-
ponents.

Eliminate foreign material 
from expansion valve, or re-
place it.

Unusual noise from belt.

—

Loose belt

Check belt tension. Refer to 

EM-17, "Adjustment"

.

Damaged or broken components in-
side compressor.

Replace compressor. Refer 
to 

HA-25, "Removal and In-

stallation"

.

REFRIGERANT

HA-17

< PERIODIC MAINTENANCE >

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PERIODIC MAINTENANCE

REFRIGERANT

Description

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CONNECTION OF SERVICE TOOLS AND EQUIPMENT

Leak Test

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CHECK REFRIGERANT LEAKS USING FLUORESCENT LEAK DETECTION DYE

1. Install a fender cover (1).
2. Wear UV safety goggles (2) provided with refrigerant dye leak detection kit.
3. Connect power cable (4) of UV lamp (6) to positive and negative terminals of the battery (3).

1.

Shut-off valve

2.

A/C service valve

3.

Recovery/recycling/recharging 
equipment

4.

Refrigerant container (HFC-134a)

5.

Weight scale

6.

Vacuum pump

7.

Manifold gauge set

A.

Preferred (best) method

B.

Alternative method

C.

For charging

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