Nissan Quest E52. Manual - part 776

HAC-234

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONING]

INSUFFICIENT HEATING

INSUFFICIENT HEATING

FRONT MANUAL AIR CONDITIONING SYSTEM

FRONT MANUAL AIR CONDITIONING SYSTEM : Description

INFOID:0000000009652676

Symptom

• Insufficient heating
• No warm air comes out. (Air flow volume is normal.)

FRONT MANUAL AIR CONDITIONING SYSTEM : Diagnosis Procedure

INFOID:0000000009652677

NOTE:
Perform self-diagnoses with on board diagnosis and CONSULT before performing symptom diagnosis. If any
malfunction result or DTC is detected, perform the corresponding diagnosis.

1.

CHECK COOLING SYSTEM

1.

Check engine coolant level and check for leakage. Refer to 

CO-8, "Inspection"

.

2.

Check radiator cap. Refer to the 

CO-12, "RADIATOR CAP : Inspection"

.

3.

Check water flow sounds of the engine coolant. Refer to 

CO-9, "Refilling"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Refill engine coolant and repair or replace the parts depending on the inspection results.

2.

CHECK FRONT HEATER HOSE

Check installation of front heater hose by visually or touching.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace parts depending on the inspection results.

3.

CHECK FRONT HEATER CORE

1.

Check temperature of inlet hose and outlet hose of front heater core.

2.

Check that inlet side of front heater core is hot and the outlet side is slightly lower than/almost equal to the
inlet side.

CAUTION:

Always perform the temperature inspection in a short period of time because the engine coolant
temperature is very hot.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace front heater core. Refer to 

HA-54, "HEATER CORE : Removal and Installation"

.

4.

CHECK AIR LEAKAGE FROM EACH DUCT

Check duct and nozzle, etc. of the front air conditioning for air leakage.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair or replace parts depending on the inspection results.

REAR MANUAL AIR CONDITIONING SYSTEM

REAR MANUAL AIR CONDITIONING SYSTEM : Description

INFOID:0000000009652678

Symptom

• Insufficient heating
• No warm air comes out. (Air flow volume is normal.)

REAR MANUAL AIR CONDITIONING SYSTEM : Diagnosis Procedure

INFOID:0000000009652679

NOTE:
Perform self-diagnoses with on board diagnosis and CONSULT before performing symptom diagnosis. If any
malfunction result or DTC is detected, perform the corresponding diagnosis.

INSUFFICIENT HEATING

HAC-235

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONING]

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1.

CHECK REAR HEATER HOSE

Check installation of rear heater hose by visually or touching.
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace parts depending on the inspection results.

2.

CHECK REAR HEATER CORE

1.

Check temperature of inlet hose and outlet hose of rear heater core.

2.

Check that inlet side of rear heater core is hot and the outlet side is slightly lower than/almost equal to the
inlet side.

CAUTION:

Always perform the temperature inspection in a short period of time because the engine coolant
temperature is very hot.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace rear heater core. Refer to 

HA-59, "HEATER CORE : Removal and Installation"

.

3.

CHECK AIR LEAKAGE FROM EACH DUCT

Check duct and nozzle, etc. of the rear air conditioning for air leakage.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair or replace parts depending on the inspection results.

HAC-236

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONING]

COMPRESSOR DOES NOT OPERATE

COMPRESSOR DOES NOT OPERATE

Description

INFOID:0000000009652680

SYMPTOM

Compressor does not operate. 

Diagnosis Procedure

INFOID:0000000009652681

NOTE:
• Perform self-diagnoses with on board diagnosis and CONSULT before performing symptom diagnosis. If

any malfunction result or DTC is detected, perform the corresponding diagnosis.

• Check that refrigerant is enclosed in cooler cycle normally. If refrigerant amount is shortage from proper

amount, perform the inspection of refrigerant leakage.

1.

CHECK MAGNET CLUTCH OPERATION

Check magnet clutch. Refer to 

HAC-228, "Component Function Check"

. 

Does it operate normally?

YES

>> GO TO 2.

NO

>> Repair or replace malfunctioning parts.

2.

CHECK REFRIGERANT PRESSURE SENSOR

Check refrigerant pressure sensor. Refer to 

EC-442, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace malfunctioning parts.

3.

CHECK A/C ON SIGNAL

Check A/C ON signal. Refer to 

HAC-218, "Component Function Check"

.

Is inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace malfunctioning parts. 

4.

CHECK BLOWER FAN ON SIGNAL

Check blower fan ON signal. Refer to 

HAC-220, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace malfunctioning parts

5.

CHECK INTAKE SENSOR CIRCUIT

Check intake sensor circuit. Refer to 

HAC-203, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace malfunctioning parts

6.

CHECK BCM OUTPUT SIGNAL

With CONSULT

1.

Select “DATA MONITOR” mode of “ECM” using CONSULT.

2.

Select “AIR COND SIG” and “HEATER FAN SW”, and check status under the following conditions.

Is the inspection result normal?

Monitor item

Condition

Status

AIR COND SIG

A/C switch

OFF (A/C indicator: OFF)

Off

ON (A/C indicator: ON)

On

HEATER FAN SW

Blower motor

OFF

Off

ON

On

COMPRESSOR DOES NOT OPERATE

HAC-237

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONING]

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YES

>> Replace IPDM E/R. Refer to 

PCS-36, "Removal and Installation"

.

NO

>> Replace BCM. Refer to 

BCS-98, "Removal and Installation"

.