Nissan Altima L32. Instruction — part 809

HAC-10

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

FUNCTION INFORMATION

VQ35DE Models

1.

A/C compressor F3

2.

Ambient sensor E211

3.

Refrigerant pressure sensor E219

4.

A/C relay (internal to IPDM E/R)

AWIIA1237ZZ

1.

A/C compressor F3

2.

Ambient sensor E211

3.

Refrigerant pressure sensor E219

4.

A/C relay (internal to IPDM E/R)

FUNCTION INFORMATION

HAC-11

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

PASSENGER COMPARTMENT

Component’s Role

INFOID:0000000004498190

1.

Intake door motor M126

2.

Front blower motor relay J-4

3.

Air mix door motor (LH) M128

4.

Mode door motor M127

5.

Blower motor M31

6.

Air mix door motor (RH) M129

AWIIA1238ZZ

Component

Reference

Air mix door motor

HAC-35, "Diagnosis Procedure"

Ambient sensor

HAC-50, "Diagnosis Procedure"

Blower motor

HAC-42, "Diagnosis Procedure"

A/C Compressor

HAC-47, "Diagnosis Procedure"

intake door motor

HAC-38, "Diagnosis Procedure"

Intake sensor

HAC-59, "Diagnosis Procedure"

In-vehicle sensor

HAC-53, "Diagnosis Procedure"

HAC-12

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

FUNCTION INFORMATION

Mode door motor

HAC-32, "Diagnosis Procedure"

Refrigerant pressure sensor

EC-975, "Diagnosis Procedure"

(QR25DE) or

EC-1503, "Diagno-

sis Procedure"

(VQ35DE)

Sunload sensor

HAC-56, "Diagnosis Procedure"

Component

Reference

REFRIGERATION SYSTEM

HAC-13

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

REFRIGERATION SYSTEM

Refrigerant Cycle

INFOID:0000000004498333

Refrigerant flow

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

through the evaporator, and back to the compressor. The refrigerant evaporation through the evaporator coil is

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

Refrigerant System Protection

INFOID:0000000004498334

Refrigerant pressure sensor

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

sor, located on the condenser. 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 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 compressor.

When the pressure of refrigerant in the system increases to an abnormal level [more than 3,727 kPa (38 kg/
cm

2

, 540 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into

the atmosphere.

LJIA0015E