Nissan Sentra. Manual - part 583

HAC-180

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

ECV (ELECTRICAL CONTROL VALVE)

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace compressor. Refer to 

HA-31, "COMPRESSOR : Removal and Installation"

.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-39, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-189, "Removal and Installation"

.

NO

>> Repair or replace malfunctioning parts.

Component Inspection

INFOID:0000000009757769

1.

CHECK ECV (ELECTRICAL CONTROL VALVE)

1. Turn ignition switch OFF.

2. Disconnect compressor connector.

3. Check continuity between compressor connector F88 terminals.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace compressor. Refer to 

HA-31, "COMPRESSOR : Removal and Installation"

.

Terminals

Condition

Resistance (k

Ω)

Temperature: 

°C (°F)

3

4

20 (68)

10.1 – 11.1

HEATER AND AIR CONDITIONING SYSTEM CONTROL SYMPTOMS

HAC-181

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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SYMPTOM DIAGNOSIS

HEATER AND AIR CONDITIONING SYSTEM CONTROL SYMPTOMS

Symptom Table

INFOID:0000000009757770

SYMPTOM TABLE

Symptom

Reference Page

A/C system does not come on.

Go to Trouble Diagnosis Procedure for A/C System.

HAC-160, "A/C 

SWITCH ASSEM-

BLY : Diagnosis Pro-

cedure"

Air outlet does not change.

Go to Trouble Diagnosis Procedure for Mode Door Motor

HAC-161, "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

HAC-163, "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

HAC-165, "Diagno-

sis Procedure"

Intake door motor does not operate normally.

Blower motor operation is malfunctioning.

Go to Trouble Diagnosis Procedure for Blower Motor.

HAC-174, "Diagno-

sis Procedure"

Magnet clutch does not engage.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

HAC-178, "Compo-

nent Function 

Check"

Insufficient cooling

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

HAC-182, "Compo-

nent Function 

Check"

Insufficient heating

Go to Trouble Diagnosis Procedure for Insufficient Heating.

HAC-184, "Compo-

nent Function 

Check"

Noise

Go to Trouble Diagnosis Procedure for Noise.

HA-20, "Symptom 

Table"

HAC-182

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

INSUFFICIENT COOLING

INSUFFICIENT COOLING

Component Function Check

INFOID:0000000009757771

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-157, "Work Procedure"

.

Does another symptom exist?

YES

>> Refer to 

HAC-181, "Symptom Table"

.

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, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5

 NO

>> Adjust or replace compressor belt. Refer to 

EM-16, "Adjustment"

.

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

>> Check air mix door motor circuit. Refer to 

HAC-163, "Diagnosis Procedure"

.

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-463, "Component Function Check"

.

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 identifier.
Is the inspection result normal?

YES

>> GO TO 9

NO

>> Check contaminated refrigerant. Refer to 

HA-21, "Description"

.

INSUFFICIENT COOLING

HAC-183

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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9.

 CHECK REFRIGERANT PRESSURE

Check refrigerant pressure with manifold gauge connected. Refer to 

HA-28, "Inspection"

.

Is the inspection result normal?

YES

>> Perform diagnostic work flow. Refer to 

HA-15, "Workflow"

.

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 

HA-15, "Workflow"

.

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.