Nissan Quest E52. Manual - part 752

HAC-138

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

INSUFFICIENT COOLING

INSUFFICIENT COOLING

FRONT AUTOMATIC AIR CONDITIONING SYSTEM

FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Description

INFOID:0000000009652584

Symptom

• Insufficient cooling
• No cool air comes out. (Air flow volume is normal.)

FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Diagnosis Procedure

INFOID:0000000009652585

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 MAGNET CLUTCH OPERATION

1.

Turn ignition switch ON.

2.

Operate fan switch.

3.

Press A/C switch.

4.

Check that A/C indicator turns ON. Check visually and by sound that compressor operates.

5.

Press A/C switch again.

6.

Check that A/C indicator turns OFF. Check that compressor stops.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Perform diagnosis of “COMPRESSOR DOES NOT OPERATE” in “SYMPTOM DIAGNOSIS”.

Refer to 

HAC-142, "Diagnosis Procedure"

.

2.

CHECK DRIVE BELT

Check tension of drive belt. Refer to 

EM-14, "Checking"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Adjust or replace drive belt depending on the inspection results.

3.

CHECK REFRIGERANT CYCLE PRESSURE

Connect recovery/recycling recharging equipment to the vehicle and perform pressure inspection with gauge.
Refer to 

HA-27, "Symptom Table"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

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

4.

CHECK AIR LEAKAGE FROM EACH DUCT

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

Is the inspection result normal?

YES

>> GO TO 5.

NO

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

5.

CHECK AMBIENT TEMPERATURE DISPLAY

Check that there is not much difference between actual ambient temperature and indicated temperature on
information display in combination meter.
NOTE:
Actual ambient temperature is sensor recognition temperature of on board self-diagnosis STEP 5-1.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Perform diagnosis for the A/C auto amp. connection recognition signal circuit. Refer to 

MWI-82,

"Diagnosis Procedure"

.

6.

CHECK SETTING OF TEMPERATURE SETTING TRIMMER (FRONT)

INSUFFICIENT COOLING

HAC-139

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

1.

Check setting value of temperature setting trimmer (front). Refer to 

HAC-82, "Temperature Setting Trim-

mer (Front)"

. 

2.

Check that temperature setting trimmer is set to “+ direction”. 
NOTE:
The control temperature can be set by setting of the temperature setting trimmer (front).

3.

Set difference between the set temperature and control temperature to “0”.

Is inspection result normal?

YES

>> INSPECTION END

NO

>> Replace front A/C control (A/C auto amp.). Refer to 

HAC-143, "Removal and Installation"

.

REAR AUTOMATIC AIR CONDITIONING SYSTEM

REAR AUTOMATIC AIR CONDITIONING SYSTEM : Description

INFOID:0000000009652586

Symptom

• Insufficient cooling
• No cool air comes out. (Air flow volume is normal.)

REAR AUTOMATIC AIR CONDITIONING SYSTEM : Diagnosis Procedure

INFOID:0000000009652587

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 REFRIGERANT CYCLE PRESSURE

Connect recovery/recycling recharging equipment to the vehicle and perform pressure inspection with gauge.
Refer to 

HA-27, "Symptom Table"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

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

2.

CHECK AIR LEAKAGE FROM EACH DUCT

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

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

3.

CHECK SETTING OF TEMPERATURE SETTING TRIMMER (REAR)

1.

Check setting value of temperature setting trimmer (REAR). Refer to 

HAC-83, "Temperature Setting Trim-

mer (Rear)"

. 

2.

Check that temperature setting trimmer is set to “+ direction”. 
NOTE:
The control temperature can be set by setting of the temperature setting trimmer (rear).

3.

Set difference between the set temperature and control temperature to “0”.

Is inspection result normal?

YES

>> INSPECTION END

NO

>> Replace front A/C control (A/C auto amp.). Refer to 

HAC-143, "Removal and Installation"

.

HAC-140

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

INSUFFICIENT HEATING

INSUFFICIENT HEATING

FRONT AUTOMATIC AIR CONDITIONING SYSTEM

FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Description

INFOID:0000000009652588

Symptom

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

FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Diagnosis Procedure

INFOID:0000000009652589

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

>> GO TO 5.

NO

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

5.

CHECK SETTING OF TEMPERATURE SETTING TRIMMER (FRONT)

1.

Check setting value of temperature setting trimmer (front). Refer to 

HAC-82, "Temperature Setting Trim-

mer (Front)"

. 

2.

Check that temperature setting trimmer is set to “

−

 direction”. 

NOTE:
The control temperature can be set by the temperature setting trimmer (front).

3.

Set difference between the set temperature and control temperature to “0”.

Are the symptoms solved?

YES

>> INSPECTION END

NO

>> Replace front A/C control (A/C auto amp.). Refer to 

HAC-143, "Removal and Installation"

.

REAR AUTOMATIC AIR CONDITIONING SYSTEM

INSUFFICIENT HEATING

HAC-141

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

REAR AUTOMATIC AIR CONDITIONING SYSTEM : Description

INFOID:0000000009652590

Symptom

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

REAR AUTOMATIC AIR CONDITIONING SYSTEM : Diagnosis Procedure

INFOID:0000000009652591

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 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

>> GO TO 4.

NO

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

4.

CHECK SETTING OF TEMPERATURE SETTING TRIMMER (REAR)

1.

Check setting value of temperature setting trimmer (rear). Refer to 

HAC-83, "Temperature Setting Trim-

mer (Rear)"

.

2.

Check that temperature setting trimmer is set to “

−

 direction”. 

NOTE:
The control temperature can be set by the temperature setting trimmer (rear).

3.

Set difference between the set temperature and control temperature to “0”.

Are the symptoms solved?

YES

>> INSPECTION END

NO

>> Replace front A/C control (A/C auto amp.). Refer to 

HAC-143, "Removal and Installation"

.