Nissan Altima HL32 Hybrid. Instruction - part 488

HA-14

< PREPARATION >

PREPARATION

Commercial Service Tool

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CAUTION:

* Avoid using tools that have been used for vehicles with conventional A/C oil as much as possible. This will result in insula-
tion performance deterioration. A tool that has been used three times or less can be reused if ann appropriate one is not avail-
able.

Tool number
Tool name

Description

J-41810-NI
Refrigerant identifier equipment 
HFC 134a (R-134a)*

Checking refrigerant purity and system 
contamination

Power tool

Removing bolts, screws and nuts

RJIA0197E

PIIB1407E

REFRIGERATION SYSTEM

HA-15

< FUNCTION DIAGNOSIS >

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FUNCTION DIAGNOSIS

REFRIGERATION SYSTEM

Refrigerant Cycle

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Refrigerant flow

The refrigerant flows in the standard pattern, that is, through the electric compressor, the condenser with liquid

tank, through the evaporator, and back to the electric compressor. The refrigerant evaporation through the

evaporator coil is controlled by an externally equalized expansion valve, located inside the evaporator case.

Refrigerant System Protection

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Refrigerant pressure sensor

The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sen-

sor, located on the liquid tank. If the system pressure rises above or falls below the specifications, the refriger-

ant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM.

The ECM then ceases to supply power to the A/C relay which disengages and stops the electric compressor

when pressure on the high pressure side (as detected by refrigerant pressure sensor) is over approximately
2,746 kPa (28 kg/cm

2

, 398 psi), or below approximately 120 kPa (1.22 kg/cm

2

, 17.4 psi).

Pressure Relief Valve

The refrigerant system is also protected by a pressure relief valve, located in the rear head of the electric com-

pressor. When the pressure of refrigerant in the system increases to an abnormal level [more than 3,776 kPa
(38.5 kg/cm

2

, 547 psi)], the release port on the pressure relief valve automatically opens and releases refriger-

ant into the atmosphere.

1.

Electric compressor

2.

Pressure relief valve

3.

Liquid tank

4.

Refrigerant pressure sensor

5.

Condenser

6.

Expansion valve

7.

Evaporator

8.

Blower motor

A.

High-pressure gas

B.

High-pressure liquid

C.

Low-pressure liquid

D.

Low-pressure gas

E.

Suction port

F.

Discharge port

G

Outside air

AWIIA0054ZZ

HA-16

< FUNCTION DIAGNOSIS >

REFRIGERATION SYSTEM

Component Part Location

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1.

Heater and cooling unit assembly

2.

Low-pressure pipe

3.

Low-pressure A/C service valve

4.

Low-pressure flexible hose

5.

Junction pipe

6.

Air deflector RH

7.

Air deflector LH

8.

Refrigerant pressure sensor

9.

Radiator, condenser and liquid tank 
assembly

10. Electric compressor

11. High-pressure flexible hose

12. High-pressure A/C service valve

ALIIA0031ZZ

REFRIGERATION SYSTEM

HA-17

< FUNCTION DIAGNOSIS >

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13. High-pressure pipe

14. Heater hoses

15. Heater pump

16. Heater pump bracket

A.

Low-pressure flexible hose to elec-
tric compressor