Nissan Leaf. Manual — part 728

HA-34

< SYMPTOM DIAGNOSIS >

[WITH HEAT PUMP SYSTEM]

REFRIGERATION SYSTEM SYMPTOMS

SYMPTOM DIAGNOSIS

REFRIGERATION SYSTEM SYMPTOMS

Trouble Diagnosis For Unusual Pressure

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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:0000000010122114

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

, 28.4

psi). It then gradually de-
creases.

Air mixed in refrigerant cycle.

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

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

High-pressure pipe and upper
side of condenser become
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

REFRIGERATION SYSTEM SYMPTOMS

HA-35

< SYMPTOM DIAGNOSIS >

[WITH HEAT PUMP SYSTEM]

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Both high and low-pressure sides
are too low.

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-95, "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 accu-

mulator.

• Collect all refrigerant.
• Evacuate refrigerant cycle

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

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

AC353A

AC354A

HA-36

< SYMPTOM DIAGNOSIS >

[WITH HEAT PUMP SYSTEM]

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

Wear, breakage, or clogging of foreign
material inside compressor parts.

Check compressor oil. Re-
fer to

HA-29, "Inspection"

.

Compressor body

Loosened compressor mounting bolts.

Check bolts for tightness.
Refer to

HA-37, "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-43, "Exploded

View"

.

ELECTRIC COMPRESSOR

HA-37

< REMOVAL AND INSTALLATION >

[WITH HEAT PUMP SYSTEM]

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REMOVAL AND INSTALLATION

ELECTRIC COMPRESSOR

Exploded View

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Removal and Installation

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DANGER:

Since hybrid vehicles and electric vehicles contain a high voltage battery, there is the risk of

electric shock, electric leakage, or similar accidents if the high voltage component and vehicle are

handled incorrectly. Be sure to follow the correct work procedures when performing inspection and

maintenance.

WARNING:

• Be sure to remove the service plug in order to disconnect the high voltage circuits before perform-

ing inspection or maintenance of high voltage system harnesses and parts.

• The removed service plug must always be carried in a pocket of the responsible worker or placed in

the tool box during the procedure to prevent the plug from being connected by mistake.

• Be sure to wear insulating protective equipment consisting of glove, shoes, face shield and glasses

before beginning work on the high voltage system.

1.

High voltage warning label

2.

Fastener

3.

Compressor stay

4.

Electric compressor

5.

O-ring

6.

High-pressure flexible hose

7.

O-ring

8.

Low-pressure flexible hose

A.

To condenser

B.

To evaporator

: Always replace after every disassembly.

: N·m (kg-m, in-lb)

: N·m (kg-m, ft-lb)

JMIIA2634GB