Nissan Quest E52. Manual - part 709

 

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Nissan Quest E52. Manual - part 709

 

 

REFRIGERATION SYSTEM SYMPTOMS

HA-27

< SYMPTOM DIAGNOSIS >

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SYMPTOM DIAGNOSIS

REFRIGERATION SYSTEM SYMPTOMS

Trouble Diagnosis For Unusual Pressure

INFOID:0000000009651573

Diagnose using a manifold gauge whenever 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 (usual) pressure range. Refer to
above table (Ambient air temperature-to-operating pressure table) since the standard (usual) pressure, how-
ever, differs from vehicle to vehicle.

Symptom Table

INFOID:0000000009651574

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.

Collect all refrigerant, evacuate 
refrigerant cycle again, and 
then refill it with the specified 
amount of refrigerant.

Air flow to condenser is insuf-
ficient.

Insufficient condenser cooling 
performance.
• Poor fan rotation of radiator 

and condenser.

• Improper installation of air 

guide.

• Clogged or dirty condenser 

fins.

• Repair or replace malfunc-

tioning parts.

• Clean and repair condenser 

fins.

When compressor is stopped, 
a high-pressure reading 
quickly drops by approximate-

ly 196 kPa (2 kg/cm

2

, 28 psi). 

It then gradually decreases.

Air mixed in refrigerant cycle.

Collect all refrigerant, evacuate 
refrigerant cycle again, and 
then refill it with the specified 
amount of refrigerant.

• 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.

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 operation 
stops.

• There is no temperature dif-

ference between high- and 
low-pressure sides.

Malfunction in compressor sys-
tem (insufficient compressor 
pressure operation).
• Damage or breakage of 

valve.

• Malfunctioning gaskets.

Replace compressor.

AC359A

AC360A

AC356A

HA-28

< SYMPTOM DIAGNOSIS >

REFRIGERATION SYSTEM SYMPTOMS

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 in inner liquid tank 
(clogged strainer).

Replace liquid tank.

Evaporator becomes frosted.

Clogged or crushed low-pres-
sure pipe.

Repair or replace malfunction-
ing parts.

Malfunction in intake sensor .

Check intake sensor system. 
Refer to 

HAC-203, "Diagnosis 

Procedure"

.

There is a small temperature 
difference between the high 
and low pressure pipes for re-
frigerant cycle.

• Shortage of refrigerant.
• Leakage of refrigerant.

• Check for leakage.
• Collect all refrigerant, evacu-

ate refrigerant cycle again, 
and then refill it with the spec-
ified amount of 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 the mixing of 

water in cooler cycle.

• Deteriorated dryer in liquid 

tank.

• Collect all refrigerant.
• Evacuate refrigerant cycle 

completely, and then refill it 
with the specified amount of 
refrigerant. At this time, al-
ways replace liquid tank.

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

AC353A

AC354A

NOISE

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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

Wear, breakage, or clogging of foreign 
material in inner parts.

Check compressor oil. Re-
fer to 

HA-22, "Inspection"

.

Magnet clutch

Contact of clutch disc with pulley.

Check clearance between 
clutch disc and pulley. Refer 
to 

HA-32, "Inspection"

.

Compressor body

Loosened compressor mounting bolts.

Check bolts for tightness. 
Refer to 

HA-30, "Exploded 

View"

.

Unusual noise from cooler piping.

Cooler piping (pipe and 
flexible hose)

Improper installation of clip and brack-
et.

Check the installation condi-
tion of the cooler piping. Re-
fer to 

HA-34, "Exploded 

View"

.

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

Expansion valve

Shortage of refrigerant.

• Check for leakage.
• Collect all refrigerant, 

evacuate refrigerant cycle 
again, and then refill it 
with the specified amount 
of refrigerant.

Wear, breakage, or clogging of foreign 
material in inner parts.

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

Unusual noise from belt.

Loosened belt

Check belt tension. Refer to 

EM-14, "Checking"

.

Internal compressor parts get locked

Replace compressor.

HA-30

< REMOVAL AND INSTALLATION >

COMPRESSOR

REMOVAL AND INSTALLATION

COMPRESSOR

Exploded View

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REMOVAL

DISASSEMBLY

COMPRESSOR

1.

Compressor

: N·m (kg-m, ft-lb)

JPIIA1256GB

1.

Clutch disc

2.

Shim

3.

Snap ring

4.

Pulley assembly

5.

Field coil

6.

Compressor unit

: N·m (kg-m, in-lb)

: N·m (kg-m, ft-lb)

JMIIA0906GB

 

 

 

 

 

 

 

Content   ..  707  708  709  710   ..