Nissan Sentra. Manual - part 527

HA-2

HIGH-PRESSURE PIPE : Removal and Installa-
tion ..........................................................................

37

CONDENSER ....................................................

39

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

39

CONDENSER ............................................................

39

CONDENSER : Removal and Installation ..............

39

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

40

REFRIGERANT PRESSURE SENSOR : Remov-
al and Installation ....................................................

40

HEATING AND COOLING UNIT ASSEMBLY ...

42

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

42

HEATING AND COOLING UNIT ASSEMBLY ..........

43

HEATING AND COOLING UNIT ASSEMBLY : 
Removal and Installation .........................................

43

HEATER CORE .........................................................

44

HEATER CORE : Removal and Installation ............

44

EVAPORATOR ..........................................................

44

EVAPORATOR : Removal and Installation .............

45

EXPANSION VALVE .................................................

45

EXPANSION VALVE : Removal and Installation  ....

45

SERVICE DATA AND SPECIFICATIONS 
(SDS) ..........................................................

46

SERVICE DATA AND SPECIFICATIONS 
(SDS) .................................................................

46

Service Data and Specification (SDS)  ....................

46

PRECAUTIONS

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PRECAUTION

PRECAUTIONS

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

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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

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• 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.

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PRECAUTIONS

Precaution for Procedure without Cowl Top Cover

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When performing the procedure after removing cowl top cover, cover

the lower end of windshield with urethane, etc to prevent damage to

windshield.

Precautions For Refrigerant System Service

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WORKING WITH HFC-134a (R-134a)

CAUTION:

• CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. Compressor mal-

function is likely to occur if the refrigerants are mixed, refer to “CONTAMINATED REFRIGERANT”

below. To determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refriger-

ant recovery/recycling recharging equipment and Refrigerant Identifier.

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

Compressor malfunction is likely to occur if oil other than that specified is used.

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

handling precautions must be observed:

- Cap (seal) the component immediately to minimize the entry of moisture from the atmosphere when

removing refrigerant components from a vehicle.

- Do not remove the caps (unseal) until just before connecting the components when installing refrig-

erant components to a vehicle. Connect all refrigerant loop components as quickly as possible to

minimize the entry of moisture into system.

- Use only the specified oil from a sealed container. Reseal containers of oil immediately. Oil becomes

moisture saturated and should not be used without proper sealing.

- Do not allow oil to come in contact with styrene foam parts. Damage may result.

CONTAMINATED REFRIGERANT

Take appropriate steps shown below if a refrigerant other than pure HFC-134a (R-134a) is identified in

a vehicle:

• 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 service equipment and refrigerant sup-

ply.

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

have occurred.

• In case of repairing, recover the refrigerant using only dedicated equipment and containers. Do not

recover contaminated refrigerant into the existing service equipment. Contact a local refrigerant prod-

uct retailer for available service if the facility does not have dedicated recovery equipment. 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.

• The air conditioner warranty is void if the vehicle is within the warranty period. Please contact Nissan Cus-

tomer Affairs for further assistance.

GENERAL REFRIGERANT PRECAUTION

WARNING:

• Do not breathe 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 J-2210 [HFC-134a (R-134a) recycling equipment] or J-2209 [HFC-134a (R-134a) recov-

ery equipment]. Ventilate work area before resuming service if accidental system discharge occurs.

Additional health and safety information may be obtained from refrigerant and oil manufacturers.

• Do not release refrigerant into the air. Use approved recovery/recycling recharging equipment to

capture the refrigerant each time an air conditioning system is discharged.

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PRECAUTIONS

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• Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or air

conditioning system.

• Do not store or heat refrigerant containers above 52

°C (126°F).

• Do not heat a refrigerant container with an open flame; Place the bottom of the container in a warm

pail of water if container warming is required.

• Do not intentionally drop, puncture or incinerate refrigerant containers.

• Do not refrigerant away from open flames; poisonous gas is produced if refrigerant burns.

• Refrigerant displaces oxygen; therefore be certain to work in well ventilated areas to prevent suffo-

cation.

• Do not pressure test or leakage test HFC-134a (R-134a) service equipment and/or vehicle air condi-

tioning systems with compressed air during repair. Some mixtures of air and HFC-134a (R-134a)

have been shown to be combustible at elevated pressures. These mixtures, if ignited, may cause

injury or property damage. Additional health and safety information may be obtained from refriger-

ant manufacturers.

REFRIGERANT CONNECTION

A new type of refrigerant connection has been introduced to all refrigerant lines except the following locations:

• Expansion valve to evaporator

• Refrigerant pressure sensor to liquid tank

WARNING:

Check that all refrigerant is discharged into the recycling equipment and the pressure in the system is

less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.

CAUTION:

Observe the following when replacing or cleaning refrigerant cycle components.

• Store it in the same way as it is when mounted on the vehicle when the compressor is removed. Fail-

ure to do so will cause oil to enter the low-pressure chamber.

• Always use a torque wrench and a back-up wrench when connecting tubes.

• Plug immediately all openings to prevent entry of dust and moisture after disconnecting tubes.

• Connect the pipes at the final stage of the operation when installing an air conditioner in the vehicle.

Do not remove the seal caps of pipes and other components until just before required for connec-

tion.

• Allow components stored in cool areas to warm to working area temperature before removing seal

caps. This prevents condensation from forming inside A/C components.

• Remove moisture thoroughly from the refrigeration system before charging the refrigerant.

• Always replace used O-rings.

• Apply oil to circle of the O-rings shown in illustration when connecting tube. Be careful not to apply

oil to threaded portion.

• O-ring must be closely attached to the groove portion of tube.

• Be careful not to damage O-ring and tube when replacing the O-ring.

• Connect tube until a click can be heard. Then tighten the nut or bolt by hand. Check that the O-ring is

installed to tube correctly.