Nissan Altima L32. Instruction — part 799

HA-16

< PREPARATION >

PREPARATION

Commercial Service Tool

INFOID:0000000004205487

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(J-43872)
Refrigerant dye cleaner

For cleaning dye spills.

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(J-39183-C)
Manifold gauge set (with hoses
and couplers)

Identification:
• The gauge face indicates R-134a.

Fitting size: Thread size

• 1/2” -16 ACME

Service hoses
• (J-39500-72B)

High side hose

• (J-39500-72R)

Low side hose

• (J-39500-72Y)

Utility hose

Hose color:
• Low side hose: Blue with black stripe
• High side hose: Red with black stripe
• Utility hose: Yellow with black stripe

or green with black stripe
Hose fitting to gauge:

• 1/2” -16 ACME

Service couplers
• (J-39500-20A)

High side coupler

• (J-39500-24A)

Low side coupler

Hose fitting to service hose:
• M14 x 1.5 fitting is optional or perma-

nently attached.

—

(J-39649)
Vacuum pump
(Including the isolator valve)

Capacity:
• Air displacement: 4 CFM
• Micron rating: 20 microns
• Oil capacity: 482 g (17 oz)

Fitting size: Thread size

• 1/2” -16 ACME

Tool number
(Kent-Moore No.)
Tool name

Description

SHA441F

RJIA0196E

S-NT201

S-NT202

S-NT203

PREPARATION

HA-17

< PREPARATION >

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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

HA-18

< FUNCTION DIAGNOSIS >

REFRIGERATION SYSTEM

FUNCTION DIAGNOSIS

REFRIGERATION SYSTEM

Refrigerant Cycle

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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

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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 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

REFRIGERATION SYSTEM

HA-19

< FUNCTION DIAGNOSIS >

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Component Part Location

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1.

Heater and cooling unit assembly

2.

High-pressure pipe

3.

High-pressure A/C service valve

4.

Junction pipe

5.

High-pressure flexible hose

6.

Condenser and liquid tank

7.

Air deflector RH (QR25DE shown,
VQ35DE similar)

8.

Air deflector LH (QR25DE shown,
VQ35DE similar)

9.

Refrigerant pressure sensor

10. Low-pressure flexible hose

11. Low-pressure A/C service valve

12. Low-pressure pipe

ALIIA0001GB