NISSAN PATROL 2006 Service Manual

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

Wiring Diagram Ð A/C, M Ð
YHA157
TROUBLE DIAGNOSESMANUAL
HA-19