Nissan GT-R. Manual — part 153

REFRIGERATION SYSTEM

HA-5

< SYSTEM DESCRIPTION >

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Component Parts Location

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ENGINE COMPARTMENT

PASSENGER COMPARTMENT

NNIIA0069ZZ

1.

Refrigerant pressure sensor

2.

Liquid tank

3.

Condenser

4.

Compressor

HA-6

< SYSTEM DESCRIPTION >

REFRIGERATION SYSTEM

Component Description

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1.

Expansion valve

2.

Evaporator

3.

Blower motor

JSIIA1252ZZ

Component

Description

Compressor

Intakes, compresses, and discharges refrigerant, to circulate refrigerant inside the refrigerant cycle.

Condenser

Cools refrigerant discharged from compressor, and transforms it to liquid refrigerant.

Liquid tank

Eliminates foreign matter in refrigerant, and stores temporarily liquid refrigerant.

Refrigerant pressure sensor

(This work should be performed by GT-R certified NISSAN dealer.)

Expansion valve

Transforms high-pressure liquid refrigerant to mist form low-pressure liquid refrigerant by drawing
function.

Evaporator

The mist form liquid refrigerant transforms to gas by evaporation by the air conveyed from the blower
motor. The air is cooled by the heat by evaporation.

Blower motor

Takes in air in the vehicle or fresh outside air, provides it forcedly to the air conditioner, and conveys
it inside the vehicle.

REFRIGERATION SYSTEM SYMPTOMS

HA-7

< SYMPTOM DIAGNOSIS >

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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

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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 is reduced soon after wa-
ter is splashed on condenser.

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 compressor is

stopped, high-pressure
reading quickly drops by
approximately 196 kPa (2

kg/cm

2

, 28 psi). It then de-

creases gradually thereaf-
ter.

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 open a lit-

tle compared with the speci-
fication.

↓

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, liquid tank is not so
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

HA-8

< SYMPTOM DIAGNOSIS >

REFRIGERATION SYSTEM SYMPTOMS

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 liquid
tank outlet and inlet. Outlet
temperature is extremely
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
as compared with areas
near 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-27, "Refrigerant

Leakages"

.

There is a big temperature dif-
ference between expansion
valve inlet and outlet while the
valve itself is frosted.

Expansion valve closes a little
compared with the specifica-
tion.

↓

1.

Improper expansion
valve adjustment.

2.

Malfunctioning expansion
valve.

3.

Outlet and inlet may be
clogged.

• Remove foreign particles 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 enough
or is too low.

Evaporator is frozen.

• Check intake sensor circuit.
• Replace compressor.
• Repair evaporator fins.
• Replace evaporator.
• Check the blower motor cir-

cuit.

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

AC356A

AC353A