Nissan Altima L32. Manual - part 845

HAC-154

< ECU DIAGNOSIS >

[MANUAL AIR CONDITIONER]

AIR CONDITIONER CONTROL

ABIIA0185GB

AIR CONDITIONER CONTROL

HAC-155

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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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-135, "Diagno-

sis Procedure"

Air outlet does not change.

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

HAC-119, "Diagno-

sis 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-115, "Diagno-

sis 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-115, "Diagno-

sis Procedure"

Intake door motor does not operate normally.

Blower motor operation is malfunctioning.

Go to Trouble Diagnosis Procedure for Blower Motor.

HAC-127, "Diagno-

sis Procedure"

Magnet clutch does not engage.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

HAC-131, "Diagno-

sis Procedure"

Insufficient cooling

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

HAC-156, "Compo-

nent Function 

Check"

Insufficient heating

Go to Trouble Diagnosis Procedure for Insufficient Heating.

HAC-164, "Compo-

nent Function 

Check"

Noise

Go to Trouble Diagnosis Procedure for Noise.

HAC-166, "Compo-

nent Function 

Check"

HAC-156

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

INSUFFICIENT COOLING

INSUFFICIENT COOLING

Component Function Check

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SYMPTOM: Insufficient cooling

INSPECTION FLOW

1.

 CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE DECREASE

1. Press the A/C switch. 

2. Turn temperature control dial counterclockwise to maximum cold.

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-102, "Description & Condi-

tions"

.

Does another symptom exist?

YES

>> Refer to 

HAC-155, "Symptom Matrix Chart"

.

NO

>> System OK. 

3.

 CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4

4.

 CHECK DRIVE BELTS

Check A/C 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 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-157

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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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-160, "Trouble Diagnosis For Abnor-

mal Pressure"

.

Is the inspection result normal?

YES

>> Perform diagnostic work flow. Refer to 

HAC-157, "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-157, "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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