Nissan Altima L32. Instruction — part 827

HAC-82

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR CONDITIONER CONTROL

ABIIA0178GB

AIR CONDITIONER CONTROL

HAC-83

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

SYMPTOM DIAGNOSIS

AIR CONDITIONER CONTROL

Symptom Matrix Chart

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SYMPTOM TABLE

Symptom

Reference Page

A/C system does not come on.

Go to Trouble Diagnosis Procedure for A/C System.

HAC-61, "Diagnosis

Procedure"

Air outlet does not change.

Go to Trouble Diagnosis Procedure for Mode Door Motor. (LAN)

HAC-32, "Diagnosis

Procedure"

Mode door motor does not operate normally.

Discharge air temperature does not change.

Go to Trouble Diagnosis Procedure for Air Mix Door Motor. (LAN)

HAC-28, "Diagnosis

Procedure"

Air mix door motor does not operate normal-
ly.

Intake door does not change.

Go to Trouble Diagnosis Procedure for Intake Door Motor. (LAN)

HAC-28, "Diagnosis

Procedure"

Intake door motor does not operate normally.

Blower motor operation is malfunctioning.

Go to Trouble Diagnosis Procedure for Blower Motor.

HAC-42, "Diagnosis

Procedure"

Magnet clutch does not engage.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

HAC-47, "Diagnosis

Procedure"

Insufficient cooling

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

HAC-84, "Compo-

nent Function

Check"

Insufficient heating

Go to Trouble Diagnosis Procedure for Insufficient Heating.

HAC-92, "Compo-

nent Function

Check"

Noise

Go to Trouble Diagnosis Procedure for Noise.

HAC-94, "Compo-

nent Function

Check"

HAC-84

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INSUFFICIENT COOLING

INSUFFICIENT COOLING

Component Function Check

INFOID:0000000004498234

SYMPTOM: Insufficient cooling

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE DECREASE

1. Press the AUTO switch.

2. Turn temperature control dial (LH) counterclockwise until 18

°C (32°F) is displayed.

3. Check for cold air at discharge air outlets.
Can a symptom be duplicated?

YES

>> GO TO 3

NO

>> GO TO 2

2.

CHECK FOR ANY SYMPTOMS

Perform a complete operational check and check for any symptoms. Refer to

HAC-5, "Description and Condi-

tions"

.

Does another symptom exist?

YES

>> Refer to

HAC-83, "Symptom Matrix Chart"

.

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4

4.

CHECK DRIVE BELTS

Check compressor belt tension. Refer to

EM-16, "Checking Drive Belts"

(QR25DE) or

EM-121, "Checking

Drive Belts"

(VQ35DE).

Is the inspection result normal?

YES

>> GO TO 5

NO

>> Adjust or replace A/C compressor belt. Refer to

EM-16, "Removal and Installation"

(QR25DE) or

EM-121, "Removal and Installation"

(VQ35DE).

5.

CHECK AIR MIX DOOR MOTOR OPERATION

Check and verify air mix door mechanism for smooth operation.
Does air mix door operate correctly?

YES

>> GO TO 6

NO

>> Repair or replace air mix door control linkage.

6.

CHECK COOLING FAN MOTOR OPERATION

Check and verify cooling fan motor for smooth operation.
Does cooling fan motor operation correctly?

YES

>> GO TO 7

NO

>> Check cooling fan motor. Refer to

EC-949, "Component Function Check"

(QR25DE) or

EC-1473,

"Component Function Check"

(VQ35DE).

7.

CHECK RECOVERY/RECYCLING EQUIPMENT BEFORE USAGE

Check recovery/recycling equipment before connecting to vehicle. Verify there is no pressure in the recovery/

recycling equipment by checking the gauges. If pressure exists, recover refrigerant from equipment lines.

>> GO TO 8

8.

CHECK REFRIGERANT PURITY

1. Connect recovery/recycling equipment to vehicle.

2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant indentifier.

INSUFFICIENT COOLING

HAC-85

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> GO TO 9

NO

>> Check contaminated refrigerant. Refer to

HA-24, "HFC-134a (R-134a) Service Procedure"

.

9.

CHECK REFRIGERANT PRESSURE

Check refrigerant pressure with manifold gauge connected. Refer to

HAC-88, "Trouble Diagnosis For Abnor-

mal Pressure"

.

Is the inspection result normal?

YES

>> Perform diagnostic work flow. Refer to

HAC-85, "Diagnostic Work Flow"

.

NO

>> GO TO 10

10.

CHECK FOR EVAPORATOR FREEZE UP

Start engine and run A/C. Check for evaporator freeze up.
Does evaporator freeze up?

YES

>> Perform diagnostic work flow. Refer

HAC-85, "Diagnostic Work Flow"

.

NO

>> GO TO 11

11.

CHECK AIR DUCTS

Check ducts for air leaks.
Is the inspection result normal?

YES

>> System OK.

NO

>> Repair air leaks.

Diagnostic Work Flow

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