2002 NISSAN TERRANO Service Repair Manual

Air Flow
NHA332
DESCRIPTION Ð Overall System
HA-8

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.
RHA193E
DESCRIPTION Ð Refrigeration System
HA-9

Special Service Tools
Tool number
Tool nameDescription
KV99231260
Clutch disc wrench
Removing shaft nut and clutch disc
KV99232340
Clutch disc puller
Removing clutch disc
KV99234330
Pulley installer
Installing pulley
KV99233130
Pulley puller
Removing pulley
PREPARATION
HA-10

HFC-134a (R-134a) Service Tools and
Equipment
It is important to understand that HFC-134a (R-134a) refrigerant, and the specified lubricant which must be
used with HFC-134a (R-134a), must never be mixed with CFC-12 (R-12) refrigerant and/or the CFC-12 (R-12)
lubricant.
This means that separate and non-interchangeable service equipment must be used for handling each type
of refrigerant/lubricant.
To prevent the mixing of refrigerants/lubricants, refrigerant container fittings, service hose fittings, and service
equipment fittings (equipment which handles refrigerant and/or lubricant) are different between CFC-12 (R-12)
and HFC-134a (R-134a).
Adaptors to convert from one size of fitting to another must never be used: refrigerant/lubricant contamination
will occur and compressor failure will result.
Tool number
(Kent-Moore No.)
Tool nameDescription Note
HFC-134a (R-134a)
refrigerant
Container color: Light blue
Container marking: HFC-134a (R-134a)
Fitting size: Thread size
Ilarge container 1/2²-16 ACME
KLH00-PAGR0
(Ð)
Nissan A/C System Oil
Type R
Type: Poly alkyline glycol oil (PAG), type R
Application: HFC-134a (R-134a) vane rotary
compressors (Nissan only)
Lubricity: 40 m(1.4 Imp fl oz)
(J-39500-NI) (115V)
(J-39635) (220V)
Recovery/Recycling/
Recharging
equipment (ACR4)
Function: Refrigerant Recovery and
Recycling and Recharging
(J-39400)
Electrical leak detector
Power supply:
IDC 12V (Cigarette lighter)
PREPARATION
HA-11

Tool number
(Kent-Moore No.)
Tool nameDescription Note
(J-39183)
Manifold gauge set (with
hoses and couplers)
Identification:
IThe gauge face indicates R-134a.
Fitting size: Thread size
I1/2²-16 ACME
Service hoses
IHigh side hose
(J-39501-72)
ILow side hose
(J-39502-72)
IUtility hose
(J-39476-72)
Hose color:
ILow hose: Blue with black stripe
IHigh hose: Red with black stripe
IUtility hose: Yellow with black stripe or green
with black stripe
Hose fitting to gauge:
I1/2²-16 ACME
Service couplers
IHigh side coupler
(J-39500-20)
ILow side coupler
(J-39500-24)
Hose fitting to service hose:
IM14 x 1.5 fitting (optional) or permanently
attached
(J-39650) (115V)
(J-39656) (220V)
Refrigerant weight scale
For measuring of refrigerant
Fitting size: Thread size
I1/2²-16 ACME
(J-39649) (115V)
(J-39655) (220V)
Vacuum pump
(Including the isolator
valve)
Capacity:
IAir displacement: 4 CFM
IMicron rating: 20 microns
IOil capacity: 482 g (17 oz)
Fitting size: Thread size
I1/2²-16 ACME
PREPARATION
HFC-134a (R-134a) Service Tools and
Equipment (Cont'd)
HA-12

Precautions for Service Equipment
RECOVERY/RECYCLING/RECHARGING EQUIPMENT
Be certain to follow the manufacturers instructions for machine
operation and machine maintenance. Never introduce any refriger-
ant other than that specified into the machine.
ELECTRONIC LEAK DETECTOR
Be certain to follow the manufactures instructions for tester opera-
tion and tester maintenance.
VACUUM PUMP
The lubricant contained inside the vacuum pump is not compatible
with the specified lubricant for HFC-134a (R-134a) A/C systems.
Since the vent side of the vacuum pump is exposed to atmospheric
pressure, it is possible for the vacuum pump lubricant to migrate
out of the pump into the service hose if the pump is switched off
after evacuation (vacuuming) and the service hose is not isolated
from the vacuum pump.
To prevent the migration of vacuum pump lubricant into service
hoses, it is necessary to use a valve (which can be manually
opened or closed) near the connection of the service hose to the
pump.
IOn a vacuum pump which is equipped with an isolator valve
(usually part of the vacuum pump), closing this valve will iso-
late the service hose from the pump.
IFor pumps without an isolator valve, be certain that the service
hose is equipped with a manual shut off valve near the pump
end of the hose.
IHoses which contain an automatic shut off valve at the end of
the service hose must be disconnected from the vacuum pump
to prevent the migration of lubricant: as long as the hose is
connected, the valve is open and lubricant may migrate.
One-way valves which open when vacuum is applied and close
under a no vacuum condition are not recommended, because this
valve may restrict the pump's ability to pull a deep vacuum.
MANIFOLD GAUGE SET
Be certain that the gauge face indicates R-134a or 134a. Be cer-
tain that the manifold gauge set has the 1/2²-16 ACME threaded
connections for service hoses, and that no refrigerants other than
HFC-134a (R-134a) (along with only specified lubricants) have
been used with the manifold gauge set.
RHA270D
SHA814D
PREPARATION
HA-13

SERVICE HOSES
Be certain that the service hoses display the markings described
(colored hose with black stripe). Be certain that all hoses include
positive shut off devices (either manual or automatic) near the end
of the hoses opposite the manifold gauge.
SERVICE COUPLERS
Never attempt to connect HFC-134a (R-134a) service couplers to
an CFC-12 (R-12) A/C system. Although the HFC-134a (R-134a)
couplers will not secure on to the CFC-12 (R-12) system, CFC-12
(R-12) refrigerant and lubricant will be discharged into the HFC-
134a (R-134a) coupler, causing contamination.
Shut off valve rotation A/C service valve
Clockwise Open
Counterclockwise Close
REFRIGERANT WEIGHT SCALE
If the scale allows electronic control of the flow of refrigerant
through the scale, be certain that the hose fitting size is 1/2²-16
ACME, and that no refrigerant other than HFC-134a (R-134a)
(along with only specified lubricant) has been used with the scale.
CHARGING CYLINDER
The charging cylinder is not recommended because refrigerant
may be vented into the air from the top valve of the cylinder when
filling the cylinder with refrigerant. Additionally, the accuracy of the
cylinder is generally less than that of an electronic scale or of qual-
ity recycle/recharge equipment.
RHA272D
RHA273D
RHA274D
PREPARATION
Precautions for Service Equipment (Cont'd)
HA-14

HFC-134a (R-134a) Service Procedure
DISCHARGING REFRIGERANT
WARNING:
Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. To remove R-134a from the A/C system, use service equipment certified to meet the require-
ments of R-134a recycling equipment or R-134a recovery equipment. If accidental system discharge
occurs, ventilate work area before resuming service. Additional health and safety information may be
obtained from refrigerant and lubricant manufacturers.
EVACUATING SYSTEM AND CHARGING REFRIGERANT
SHA559D
SHA560D
SERVICE PROCEDURES
HA-15