Content .. 537 538 539 540 ..

Nissan Sentra. Manual - part 539

HAC-4

POWER SUPPLY AND GROUND CIRCUIT ...

159

A/C AUTO AMP. ......................................................

159

A/C AUTO AMP. : Diagnosis Procedure ...............

159

A/C SWITCH ASSEMBLY .......................................

159

A/C SWITCH ASSEMBLY : Component Function
Check ....................................................................

159

A/C SWITCH ASSEMBLY : Diagnosis Procedure ..

160

MODE DOOR MOTOR ....................................

161

Diagnosis Procedure .............................................

161

Component Inspection ...........................................

162

AIR MIX DOOR MOTOR ..................................

163

Diagnosis Procedure .............................................

163

Component Inspection ...........................................

164

INTAKE DOOR MOTOR ..................................

165

Diagnosis Procedure .............................................

165

Component Inspection (Motor) ..............................

166

A/C SWITCH ASSEMBLY SIGNAL CIRCUIT .

167

Diagnosis Procedure .............................................

167

A/C ON SIGNAL ..............................................

168

Component Function Check ..................................

168

Diagnosis Procedure .............................................

168

INTAKE SENSOR ............................................

170

Diagnosis Procedure .............................................

170

Component Inspection ...........................................

171

BLOWER FAN ON SIGNAL ............................

172

Component Function Check ..................................

172

Diagnosis Procedure .............................................

172

BLOWER MOTOR ...........................................

174

Diagnosis Procedure .............................................

174

Component Inspection (Blower Motor) ..................

176

Component Inspection (Blower Motor Relay) ........

177

MAGNET CLUTCH ..........................................

178

Component Function Check ..................................

178

Diagnosis Procedure .............................................

178

ECV (ELECTRICAL CONTROL VALVE) ........

179

Diagnosis Procedure .............................................

179

Component Inspection ...........................................

180

SYMPTOM DIAGNOSIS ...........................

181

HEATER AND AIR CONDITIONING SYSTEM
CONTROL SYMPTOMS ...................................

181

Symptom Table .....................................................

181

INSUFFICIENT COOLING ................................

182

Component Function Check .................................

182

INSUFFICIENT HEATING ................................

184

Component Function Check .................................

184

COMPRESSOR DOES NOT OPERATE ..........

186

Description ............................................................

186

Diagnosis Procedure .............................................

186

REMOVAL AND INSTALLATION .............

188

A/C ASSEMBLY SWITCH ................................

188

Removal and Installation .......................................

188

A/C AUTO AMP. ...............................................

189

Exploded View ......................................................

189

Removal and Installation .......................................

189

INTAKE SENSOR .............................................

190

Removal and Installation .......................................

190

REFRIGERANT PRESSURE SENSOR ...........

191

Removal and Installation .......................................

191

DOOR MOTOR .................................................

192

Exploded View ......................................................

192

INTAKE DOOR MOTOR .........................................

193

INTAKE DOOR MOTOR : Removal and Installa-
tion ........................................................................

193

MODE DOOR MOTOR ............................................

193

MODE DOOR MOTOR : Removal and Installation .

193

AIR MIX DOOR MOTOR .........................................

193

AIR MIX DOOR MOTOR : Removal and Installa-
tion ........................................................................

193

BLOWER MOTOR RESISTOR ........................

194

Removal and Installation .......................................

194

PRECAUTIONS

HAC-5

< PRECAUTION >

[AUTOMATIC AIR CONDITIONER]

HAC

PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"

INFOID:0000000010287622

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along

with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain

types of collision. Information necessary to service the system safely is included in the SR and SB section of

this Service Manual.

WARNING:

• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision which would result in air bag inflation, all maintenance must be performed by

an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag

Module, see the SR section.

• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this

Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-

ness connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-

tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a

hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing

serious injury.

• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the

battery and wait at least three minutes before performing any service.

Precaution for Work

INFOID:0000000009757612

• When removing or disassembling each component, be careful not to damage or deform it. If a component

may be subject to interference, be sure to protect it with a shop cloth.

• When removing (disengaging) components with a screwdriver or similar tool, be sure to wrap the component

with a shop cloth or vinyl tape to protect it.

• Protect the removed parts with a shop cloth and prevent them from being dropped.

• Replace a deformed or damaged clip.

• If a part is specified as a non-reusable part, always replace it with a new one.

• Be sure to tighten bolts and nuts securely to the specified torque.

• After installation is complete, be sure to check that each part works properly.

• Follow the steps below to clean components:

- Water soluble dirt:

• Dip a soft cloth into lukewarm water, wring the water out of the cloth and wipe the dirty area.

• Then rub with a soft, dry cloth.

- Oily dirt:

• Dip a soft cloth into lukewarm water with mild detergent (concentration: within 2 to 3%) and wipe the dirty

area.

• Then dip a cloth into fresh water, wring the water out of the cloth and wipe the detergent off.

• Then rub with a soft, dry cloth.

- Do not use organic solvent such as thinner, benzene, alcohol or gasoline.

- For genuine leather seats, use a genuine leather seat cleaner.

Working with HFC-134a (R-134a)

INFOID:0000000009757613

WARNING:

• CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants

are mixed compressor failure is likely to occur. Refer to

HA-25, "Inspection"

. To determine the purity

of HFC-134a (R-134a) in the vehicle and recovery tank, use Refrigerant Recovery/Recycling Recharg-

ing equipment and Refrigerant Identifier.

HAC-6

< PRECAUTION >

[AUTOMATIC AIR CONDITIONER]

PRECAUTIONS

• Use only specified oil for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components. If

oil other than that specified is used, compressor failure is likely to occur.

• The specified HFC-134a (R-134a) oil rapidly absorbs moisture from the atmosphere. The following

handling precautions must be observed:

- When removing refrigerant components from a vehicle, immediately cap (seal) the component to

minimize the entry of moisture from the atmosphere.

- When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just

before connecting the components. Connect all refrigerant loop components as quickly as possible

to minimize the entry of moisture into system.

- Only use the specified oil from a sealed container. Immediately reseal containers of oil. Without

proper sealing, oil will become moisture saturated and should not be used.

- Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.

Remove HFC-134a (R-134a) from the A/C system using certified service equipment meeting require-

ments of SAE J2210 [HFC-134a (R-134a) recycling equipment], or J2209 [HFC-134a (R-134a) recy-

cling equipment], If accidental system discharge occurs, ventilate work area before resuming

service. Additional health and safety information may be obtained from refrigerant and oil manufac-

turers.

- Do not allow A/C oil to come in contact with styrofoam parts. Damage may result.

CONTAMINATED REFRIGERANT

If a refrigerant other than pure HFC-134a (R-134a) is identified in a vehicle, your options are:

• Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant into

the atmosphere.

• Explain that recovery of the contaminated refrigerant could damage your service equipment and refrigerant

supply.

• Suggest the customer return the vehicle to the location of previous service where the contamination may

have occurred.

• If you choose to perform the repair, recover the refrigerant using only dedicated equipment and contain-

ers. Do not recover contaminated refrigerant into your existing service equipment. If your facility does

not have dedicated recovery equipment, you may contact a local refrigerant product retailer for available ser-

vice. This refrigerant must be disposed of in accordance with all federal and local regulations. In addition,

replacement of all refrigerant system components on the vehicle is recommended.

• If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact NISSAN Cus-

tomer Affairs for further assistance.

Precaution for Service Equipment

INFOID:0000000009757614

MANIFOLD GAUGE SET

Be certain that the gauge face indicates R-134a or 134a. Make sure

the gauge set has 1/2

″-16 ACME threaded connections for service

hoses. Confirm the set has been used only with refrigerant HFC-

134a (R-134a) along with specified oil.

SERVICE HOSES

SHA533D

PRECAUTIONS

HAC-7

< PRECAUTION >

[AUTOMATIC AIR CONDITIONER]

HAC

Be certain that the service hoses display the markings described

(colored hose with black stripe). All hoses must include positive shut-

off devices (either manual or automatic) near the end of the hoses

opposite the manifold gauge.

SERVICE COUPLERS

Do not attempt to connect HFC-134a (R-134a) service couplers to a

CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will

not properly connect to the CFC-12 (R-12) system. However, if an

improper connection is attempted, discharging and contamination

may occur.

RHA272D

Shut-off valve rotation

A/C service valve

Clockwise

Open

Counterclockwise

RHA273D

Content .. 537 538 539 540 ..