2004 NISSAN TERRANO Service Repair Manual

Precautions for Working with HFC-134a
(R-134a)
WARNING:I CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant must never be mixed, even in the
smallest amounts, as they are incompatible with each other. If the refrigerants are mixed, com-
pressor failure is likely to occur.
I Use only specified lubrication oil for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a)
components. If lubrication oil other than that specified is used, compressor failure is likely to
occur.
I The specified HFC-134a (R-134a) lubrication oil absorbs moisture from the atmosphere at a rapid
rate, therefore the following handling precautions must be observed:
a: When removing refrigerant components from a vehicle, immediately cap (seal) the component to minimize the entry of moisture from the atmosphere.
b: When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just before connecting the components. Also, complete the connection of all refrigerant loop
components as quickly as possible to minimize the entry of moisture into the system.
c: Use the specified lubrication oil from a sealed container only. Containers must be re-sealed immediately after dispensing the lubrication oil. Lubrication oil in containers which are not
properly sealed will become moisture saturated, and such lubrication oil is no longer suitable
for use and should be properly disposed of.
d: Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and throat. Use only approved recovery/recycling equipment to discharge HFC-134a (R-134a)
system. If accidental system discharge occurs, ventilate work area before resuming service.
Additional health and safety information may be obtained from refrigerant and lubricant
manufacturers.
e: Do not allow lubrication oil (Nissan A/C System Oil Type S or Type R) to come in contact with styrofoam parts. Damage may result.
General Refrigerant Precautions
WARNING:
I Do not release refrigerant into the air. Use approved recovery/recycling equipment to capture the
refrigerant every time an air conditioning system is discharged.
I Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or
air conditioning system.
I Do not store or heat refrigerant containers above 52ÉC (125ÉF).
I Do not heat a refrigerant container with an open flame; if container warming is required, place the
bottom of the container in a warm pail of water.
I Do not drop, puncture, or incinerate refrigerant containers.
I Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns.
I Refrigerant will displace oxygen, therefore be certain to work in well ventilated areas to prevent
suffocation.
I Do not introduce compressed air to any refrigerant container or refrigerant component.
PRECAUTIONS
HA-4
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Precautions for Refrigerant Connection
WARNING:
Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system
is less than atmospheric. Then gradually loosen the discharge side hose fitting and remove it.
CAUTION:
When replacing or cleaning refrigerant cycle components, observe the following.
IDo not leave compressor on its side or upside down for more than 10 minutes, as compressor oil
will enter low pressure chamber.
I When connecting tubes, always use a torque wrench and a back-up wrench.
I After disconnecting tubes, plug all openings immediately to prevent entrance of dirt and moisture.
I When installing an air conditioner in the vehicle, the pipes must be connected at the final stage of
the operation. The seal caps of the pipes and other components must not be removed until their
removal is required for connection.
I To prevent the condensation of moisture inside A/C components, components stored in cool areas
should be allowed to warm to the working area temperature before removing the seal caps.
I Thoroughly remove moisture from the refrigeration system before charging the refrigerant.
I Always replace used O-rings.
I When connecting tube, apply lubrication oil to portions shown in illustration. Be careful not to
apply oil to threaded portion.
Lubrication oil name: NISSAN A/C System Oil Type S
Part number: KLH00-PAGS0
I O-ring must be closely attached to inflated portion of tube.
I After inserting tube into union until O-ring is no longer visible, tighten nut to specified torque.
I After connecting line, conduct leak test and make sure that there is no leakage from connections.
When the gas leaking point is found, disconnect that line and replace the O-ring. Then tighten
connections of seal seat to the specified torque.
SHA525D
PRECAUTIONS
HA-5
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Precautions for Servicing Compressor
IAttach a blind plug to the suction port (low pressure) and discharge port (high pressure) of the
compressor to prevent oil from leaking out and dust from getting inside.
I When the compressor is removed, store it under the same condition as it is when mounted on the
car.
I When replacing or repairing compressor, be sure to remove oil from the compressor and check
the oil quantity extracted.
I When replacing with a new compressor, be sure to remove oil from the new compressor so that
the quantity of oil remaining in the new compressor is equal to the quantity collected from the
removed compressor. See the section ªLUBRICATION OILº.
I Pay attention so as not to allow dirt and oil to attach on the friction surfaces between clutch and
pulley. If the surface is contaminated, with oil, wipe it off by using a clean waste cloth moistened
with thinner.
I After completing the compressor service operation, be sure to rotate the compressor shaft more
than five turns in both directions by hand to equalize oil distribution inside the compressor, then
run the compressor for about one hour by idling the engine.
I When the compressor magnet clutch has been replaced, be sure to check the magnet clutch for
normal operation by applying voltage to the clutch.
PRECAUTIONS
HA-6
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Control Operation
FAN CONTROL DIAL
This DIAL turns the fan ON and OFF, and controls fan speed.
AIR CONTROL DIAL
This DIAL allows outlet air to flow.
TEMPERATURE CONTROL DIAL
This DIAL allows the temperature of the outlet air to be adjusted.
AIR RECIRCULATION SWITCH
OFF position:
Outside air is drawn into the passenger compartment.
ON position (Indicator light ON):
Interior air is recirculated inside the vehicle.
AIR CONDITIONER SWITCH
Start the engine, turn the fan control dial to the desired (1 to 4) position and press the air conditioner switch
to turn ON the air conditioner. The indicator light will come on when the air conditioner is ON. To stop the air
conditioner, push the switch again to return it to the original position.
The air conditioner cooling function operates only when the engine is running.
NHA331
DESCRIPTION Ð Overall System
HA-7
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Component Layout
NHA339
DESCRIPTION Ð Overall System
HA-8
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Air Flow
NHA332
DESCRIPTION Ð Overall System
HA-9
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Refrigeration Cycle
REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser, the liquid tank,
through the evaporator, and back to the compressor.
The refrigerant evaporation through the evaporator coil is controlled by an externally equalized expansion
valve, located inside the evaporator case.
FREEZE PROTECTION
The compressor cycles on and off to maintain the evaporator temperature within a specified range. When the
evaporator coil temperature falls below a specified point, the thermo control amplifier interrupts the compres-
sor operation. When the evaporator coil temperature rises above the specification, the thermo control ampli-
fier allows compressor operation.
REFRIGERANT SYSTEM PROTECTION
Dual-pressure switch
The refrigerant system is protected against excessively high or low pressures by the dual-pressure switch,
located on the liquid tank. If the system pressure rises above, or falls below the specifications, the dual-pres-
sure switch opens to interrupt the compressor operation.
Pressure relief valve
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compres-
sor. When the pressure of refrigerant in the system increases to an unusual level [more than 3,700 kPa (37.0
bar, 37.7 kg/cm
2, 537 psi)], the release port on the pressure relief valve automatically opens and releases
refrigerant into the atmosphere.
RHA341I
DESCRIPTION Ð Refrigeration System
HA-10
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Special Service Tools
Tool number
Tool nameDescription
KV99231260
Clutch disc wrench
Removing shaft nut and clutch disc
KV992T0001
Clutch disc puller
Removing clutch disc
KV992T0002
Pulley installer
Installing pulley
PREPARATION
HA-11
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