1998 NISSAN PATROL Heather And Air Conditioner Workshop Manual

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

YHA158
TROUBLE DIAGNOSESMANUAL
Wiring Diagram Ð A/C, M Ð (Cont'd)
HA-20

How to Perform Trouble Diagnoses for Quick
and Accurate Repair
WORK FLOW
*1: HA-22
SYMPTOM TABLE
Symptom Reference page
+Intake door does not change.+Go to Trouble Diagnosis Procedure for Intake Door
Motor Circuit.HA-24
+Blower motor does not rotate at all.+Go to Trouble Diagnosis Procedure for Blower Motor
Circuit.HA-28
+Insufficient cooling.+Go to Trouble Diagnosis Procedure for Insufficient
Cooling.HA-32
+Insufficient heating.+Go to Trouble Diagnosis Procedure for Insufficient
Heating.HA-32
+Air outlet does not change.+Go to Trouble Diagnosis Procedure for Air Outlet. HA-41
+Magnet clutch does not engage when A/C switch and
fan switch are ON.+Go to Trouble Diagnosis Procedure for Magnet Clutch
Circuit.HA-43
+Noise+Go to Trouble Diagnosis Procedure for Noise. HA-48
SHA900E
TROUBLE DIAGNOSESMANUAL
HA-21

Operational Check
The purpose of the operational check is to con®rm that the system
operates properly.
CONDITIONS
Engine running at normal operating temperature.
PROCEDURE
1. Check blower
a. Turn fan control knob to 1-speed.
Blower should operate on 1-speed.
b. Then turn fan control knob to 2-speed.
c. Continue checking blower speed until all four speeds are
checked.
d. Leave blower on 4-speed.
2. Check discharge air
a. Turn mode control knob.
b. Con®rm that discharge air comes out according to the air dis-
tribution table at left.
Refer to ``Discharge Air Flow'' in ``DESCRIPTION'' (HA-13).
RHA583G
RHA584G
RHA654F
TROUBLE DIAGNOSESMANUAL
HA-22