NISSAN PATROL 1998 Y61 / 5.G Heather And Air Conditioner User Guide

Precautions for Service Equipment
RECOVERY/RECYCLING EQUIPMENT
Follow the manufacturer's instructions for machine operation and
machine maintenance. Never introduce any refrigerant other than
that speci®ed into the machine.
ELECTRONIC LEAK DETECTOR
Follow the manufacture's instructions for tester operation and tester
maintenance.
VACUUM PUMP
The lubricant contained inside the vacuum pump is not compatible
with the speci®ed lubricant for HFC-134a (R-134a) A/C systems.
The vent side of the vacuum pump is exposed to atmospheric
pressure. So the vacuum pump lubricant may migrate out of the
pump into the service hose. This is possible when the pump is
switched off after evacuation (vacuuming) and hose is connected
to it.
To prevent this migration, use a manual valve situated near the
hose-to-pump connection, as follows.
+Usually vacuum pumps have a manual isolator valve as part of
the pump. Close this valve to isolate the service hose from the
pump.
+For pumps without an isolator, use a hose equipped with a
manual shut-off valve near the pump end. Close the valve to
isolate the hose from the pump.
+If the hose has an automatic shut off valve, disconnect the hose
from the pump: as long as the hose is connected, the valve is
open and lubricating oil may migrate.
Some one-way valves open when vacuum is applied and close
under a no vacuum condition. Such valves may restrict the pump's
ability to pull a deep vacuum and are not recommended.
MANIFOLD GAUGE SET
Be certain that the gauge face indicates R-134a or 134a. Make
sure the gauge set has 1/2²-16 ACME threaded connections for
service hoses. Con®rm the set has been used only with refrigerant
HFC-134a (R-134a) along with speci®ed lubricant.
SERVICE HOSES
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.
RHA270D
SHA533D
RHA272D
PRECAUTIONS AND PREPARATIONMANUAL AND AUTO
HA-9

SERVICE COUPLERS
Never attempt to connect HFC-134a (R-134a) service couplers to
an 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 contamina-
tion may occur.
Shut-off valve rotation A/C service valve
Clockwise Open
Counterclockwise Close
REFRIGERANT WEIGHT SCALE
Verify that no refrigerant other than HFC-134a (R-134a) and speci-
®ed lubricants have been used with the scale. If the scale controls
refrigerant ¯ow electronically, the hose ®tting must be 1/2²-16
ACME.
CHARGING CYLINDER
Using a charging cylinder is not recommended. Refrigerant may be
vented into air from cylinder's top valve when ®lling the cylinder with
refrigerant. Also, the accuracy of the cylinder is generally less than
that of an electronic scale or of quality recycle/recharge equipment.
RHA273D
RHA274D
PRECAUTIONS AND PREPARATIONMANUAL AND AUTO
Precautions for Service Equipment (Cont'd)
HA-10

Refrigeration Cycle
REFRIGERANT FLOW
The refrigerant ¯ow is in the standard pattern. Refrigerant ¯ows through the compressor, condenser, liquid
tank, 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 speci®ed range. When the
evaporator coil temperature falls below a speci®ed point, the thermo control ampli®er interrupts the compres-
sor operation. When the evaporator coil temperature rises above the speci®cation, the thermo control ampli-
®er allows compressor operation.
REFRIGERANT SYSTEM PROTECTION
Dual-pressure switch
The dual-pressure switch is located on the liquid tank. If the system pressure rises or falls out of specifications,
the switch opens to interrupt compressor clutch operation.
RHA735G
DESCRIPTIONMANUAL AND AUTO
HA-11

Component Layout
RHA699G
DESCRIPTIONMANUAL AND AUTO
HA-12

Discharge Air Flow
RHA700G
DESCRIPTIONMANUAL AND AUTO
HA-13

Wiring Diagram Ð R/HEAT Ð/LHD Models
THA165
TROUBLE DIAGNOSESREAR HEATER
HA-14

Wiring Diagram Ð R/HEAT Ð/RHD Models
THA166
TROUBLE DIAGNOSESREAR HEATER
HA-15

System Description
SWITCH AND THEIR CONTROL FUNCTIONS
Knob/SwitchKnob/Switch position
Air outlet Intake air Compressor
A/C
A/CjÐ Ð ON*
Mode
jVENT Ð Ð
jB/L Ð Ð
jFOOT Ð Ð
jD/F FRE Ð
jDEF FRE ON*
jÐÐÐ
*: Compressor is operated by dual-pressure switch.
Control Operation
FAN CONTROL KNOB
This knob turns the fan ON and OFF, and controls fan speed.
MODE CONTROL KNOB
This knob controls the outlet air ¯ow.
TEMPERATURE CONTROL KNOB
This knob allows adjustment of the temperature of the outlet air.
RECIRCULATION (REC) SWITCH
OFF position: Outside air is drawn into the passenger compartment.
ON position: Interior air is recirculated inside the vehicle. The indicator lamp will also light.
AIR CONDITIONER SWITCH
The air conditioner switch controls the A/C system. When the switch is depressed with the fan ON, the com-
pressor will turn ON. The indicator lamp will also light.
The air conditioner cooling function operates only when the engine is running.
RHA582G
DESCRIPTIONMANUAL
HA-16

Component Location
ENGINE COMPARTMENT
RHA641G
TROUBLE DIAGNOSESMANUAL
HA-17

PASSENGER COMPARTMENT
SHA063F
TROUBLE DIAGNOSESMANUAL
Component Location (Cont'd)
HA-18