Nissan Quest E52. Manual - part 706

SYSTEM

HA-15

< SYSTEM DESCRIPTION >

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The refrigerant from the compressor, flows the condenser with liquid tank, the evaporator, and returns to the
compressor. The refrigerant evaporation in the evaporator is controlled by an expansion valve.

Freeze Protection

When evaporator fin temperature is low, compressor stops so that freeze of evaporator can be prevented.
• Refer to 

HAC-19, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Compressor Control"

. (Automatic

air conditioning)

• Refer to 

HAC-163, "FRONT MANUAL AIR CONDITIONING SYSTEM : Compressor Control"

. (Manual air

conditioning)

REFRIGERANT SYSTEM PROTECTION

Refrigerant Pressure Sensor

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

sensor, installed at the upper liquid tank. The refrigerant pressure sensor detects the pressure inside the
refrigerant line and sends the voltage signal to the ECM if the system pressure rises above, or falls below
the specifications. 

• ECM turns the A/C relay to OFF and stops the compressor when the high-pressure side detected by refriger-

ant pressure sensor is following conditions;

- Approximately 3,120 kPa (31.8 kg/cm

2

, 452 psi) or more (Engine speed is less than 1,500 rpm.)

- Approximately 2,740 kPa (27.9 kg/cm

2

, 397 psi) or more (Engine speed is 1,500 rpm or more.)

- Approximately 140 kPa (1.4 kg/cm

2

, 20 psi) or less

Pressure Relief Valve

The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
The release port on the pressure relief valve automatically opens and releases refrigerant into the atmosphere
when the pressure of refrigerant in the system increases to an unusual level [more than 3,800 kPa (38.8 kg/
cm

2

, 551 psi)].

HA-16

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

INFOID:0000000009651562

OVERALL SEQUENCE

DETAILED FLOW

1.

INTERVIEW FOR MALFUNCTION

Interview the symptom to the customer.

NNIIA0143GB

DIAGNOSIS AND REPAIR WORKFLOW

HA-17

< BASIC INSPECTION >

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>> GO TO 2.

2.

SYMPTOM CHECK

Check the symptom from the customer's information. Check that any symptom occurs other than the inter-
viewed symptom.

Insufficient cooling/heating>>GO TO 3.
Refrigerant leakage>>GO TO 6.
Noise >> GO TO 7.

3.

CONTROL SYSTEM DIAGNOSIS

Perform the system diagnosis for the A/C control system.
• Refer to 

HAC-73, "Work Flow"

. (Automatic air conditioning)

• Refer to 

HAC-191, "Work Flow"

. (Manual air conditioning)

Is A/C control system normal?

YES

>> GO TO 4.

NO

>> GO TO 8.

4.

PERFORMANCE TEST

Perform the performance test. Check the operation of each part. Refer to 

HA-25, "Inspection"

.

>> GO TO 5.

5.

TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE

Diagnose using a manifold gauge whenever system's high and/or low side pressure(s) is/are unusual. Specify
the malfunctioning part. Refer to 

HA-27, "Symptom Table"

.

Low refrigerant charge>>GO TO 6.
Except above>>GO TO 8.

6.

CHECK REFRIGERANT FOR LEAKAGES

Check refrigerant for leakages. Specify the malfunctioning part. Refer to 

HA-18, "Leak Test"

.

>> GO TO 8.

7.

TROUBLE DIAGNOSIS FOR NOISE

Perform trouble diagnosis for noise. Specify the malfunctioning part. Refer to 

HA-29, "Symptom Table"

.

>> GO TO 8.

8.

MALFUNCTION PART REPAIR

Repair or replace the malfunctioning part.

>> GO TO 9.

9.

REPAIR CHECK (OPERATION CHECK)

Check the operation of each part.

Does it operate normally?

YES

>> INSPECTION END

NO

>> GO TO 2.

HA-18

< BASIC INSPECTION >

REFRIGERANT

REFRIGERANT

Description

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CONNECTION OF SERVICE TOOLS AND EQUIPMENT

Leak Test

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CHECK REFRIGERANT LEAKAGE USING FLUORESCENT LEAK DETECTION DYE

1.

Install a fender cover (1).

2.

Wear UV safety goggles (2) provided with refrigerant dye leak detection kit.

3.

Connect power cable (4) of UV lamp (6) to positive and negative terminals of the battery (3).

4.

Press UV lamp switch (5) and check A/C system for refrigerant leakage. (Where refrigerant leakage
occurs, fluorescent leak detection dye appears in green color.)

WARNING:

1.

Shut-off valve

2.

A/C service valve

3.

Recovery/recycling/recharging 
equipment

4.

Refrigerant container (HFC-134a)

5.

Weight scale (J-39650)

6.

Vacuum pump (J-39649)

7.

Manifold gauge set (J-39183)

A.

Preferred (best) method

B.

Alternative method

C.

For charging

JSIIA0239ZZ

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