high ISUZU TROOPER 1998 Service Owner's Guide

1B Ð 52 AIR CONDITIONING
REAR COOLER PARTS (ROOF DUCT TYPE)
16
15
14
2
3
4
5
7
6 1
13
11
12
10
9
8
Legend
(1) Roof Duct Bracket
(2) Roof Duct
(3) Lower Duct
(4) Resistor
(5) Wire Harness
(6) Liquid Line (high pressure pipe)
(7) Suction Line (low pressure pipe)
(8) Drain Hose(9) Cover Assembly
(10) Filter
(11) Cooling Unit
(12) Grille Assembly
(13) Panel
(14) Knob
(15) Nut
(16) Fan Control Switch
855RY00001

AIR CONDITIONING 1B Ð 57
FAN CONTROL SWITCH
Inspection
Using an electric circuit tester, check continuity between
terminals.
If not as specified, replace the switch.
1234
OFF
LOW
MEDIUM
HIGH
Fan control switch
OFF
L 0.5 LG
0.85 Y
0.85 RG 0.85 B
M
H1
2
3
4
Resistor
0.5½1.1½
Mo MH ML
0.5 LG(ML)
0.85 WR(Mo)0.85 RG(MH)
RESISTOR
Inspection
Using an electric circuit tester, check the resistance
between the terminals specified below.
If the resistances are not as specified, replace the resistor.
Terminal Resistance (½)
Mo ~ MH 0.5
Mo ~ ML 1.6
825RY00058
826RY00016

1BÐ60 AIR CONDITIONING




















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FULL AUTOMATIC AIR CONDITIONING SYSTEM
GENERAL DESCRIPTION
Using a variety of sensors, this full automatic heater and air conditioner accurately senses outside air
temperature, solar radiation quantity, evaporatorÕs blowing temperature, heater core coolant temperature
and interior temperature, then enters these data to the automatic heater/air conditioner control unit
(equipped with the built-in micro-computer). The data provided to the control unit enables to automatically
control blow temperature and blow air quantity, turn on or off the compressor and switch the blow port as
well as switching between the fresh air intake and interior air circulation.
Resetting the automatic function allows you to switch to the manual control mode.
The self-diagnosis function of the automatic heater and air conditioner control unit (with the built-in micro-
computer) allows the unit to access and diagnose a failed part easier and quicker.
Full Automatic Air Conditioner Parts Configuration
865RY0004
Legend
(1) Lower Center Vent Box
(2) Sun Sensor
(3) Mix Actuator
(4) Mode Actuator
(5) Heater Unit
(6) In Car Sensor(7) Pollen Filter
(8) Automatic Air Conditioner Control Unit
(9) Max-High Relay
(10) Blower Unit
(11) Intake Actuator
(12) Duct Sensor
(13) Evaporator Assembly
This illustration is based on RHD

1BÐ76 AIR CONDITIONING
10
71
1
5
6
12
13
11
2
3
4
8
9
852RY00001
Legend
(1) Liquid Line (High Pressure Pipe)
(2) Pressure Switch
(3) Ambient Sensor
(4) Receiver Drier
(5) Discharge Line (High Pressure Hose)
(6) Suction Line (Low Pressure Hose)(7) Compressor
(8) Condenser Assembly
(9) Drive Belt
(10) Compressor Bracket
(11) Drain Hose
(12) Evaporator Assembly
(13) O-ring
AIR CONDITIONING PARTS
6VE1 (RHD)

AIR CONDITIONING 1BÐ77
910
6
12
13
3
2
4
5
7
8 11
1
852RY00002
Legend
(1) Liquid Line (High-Pressure Pipe)
(2) O-ring
(3) Discharge Line (High-Pressure Hose)
(4) Pressure Switch
(5) Receiver Drier
(6) Ambient Sensor(7) Condenser Assembly
(8) Drive Belt
(9) Compressor
(10) Drain Hose
(11) Suction Line (Low-Pressure Hose)
(12) Evaporator Assembly
(13) A/C Switch
6VE1 (LHD)

1BÐ78 AIR CONDITIONING
107 13
65 12
14
1115
2 1
3
9 8
4
852RY00003
Legend
(1) Liquid Line (High-Pressure Pipe)
(2) Pressure Switch
(3) Receiver Drier
(4) Ambient Sensor
(5) Compressor Bracket
(6) Discharge Line (High-Pressure Hose)
(7) Suction Line (Low-Pressure Hose)(8) Compressor
(9) Condenser Assembly
(10) O-ring
(11) Insulator Pipe
(12) Suction Line (Low-Pressure Pipe)
(13) Drain Hose
(14) Evaporator Assembly
(15) A/C Switch
4JX1 (RHD)

AIR CONDITIONING 1BÐ79
852RY00004
107
65
12
2 1
3
9 8
11
4
Legend
(1) Liquid Line (High-Pressure Pipe)
(2) Pressure Switch
(3) Receiver Drier
(4) Ambient Sensor
(5) Compressor Bracket
(6) Discharge Line (High-Pressure Hose)(7) Suction Line (Low-Pressure Hose)
(8) Compressor
(9) Condenser Assembly
(10) Drain Hose
(11) Evaporator Assembly
(12) A/C Switch
4JX1 (LHD)

AIR CONDITIONING 1BÐ113
Inspection of the Fan Motor System
H-26
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0.3 BR
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0.3 GR/L 123.0 L 3.0 L/R
C-19 25A
FUSE
C-20 10A
FUSE
Blower Motor
Max High
Relay Power
Transistor Auto A/C
Control Unit
B-36
I-51
I-51 I-51
I-32 I-33
12
33 14
H-20
H-2610
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2
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D08RY00181

COMPRESSOR OVERHAUL 1D Ð 3
solvent, and dried with dry air. Use only lint free
cloths to wipe parts.
The operations described below are based on
bench overhaul with compressor removed from the
car, except as noted. They have been prepared in
order of accessibility of the components. When the
compressor is removed from the car for servicing,
the oil remaining in the compressor should be
discarded and new refrigerant oil added to the
compressor.
Magnetic clutch assembly repair procedures require
that the system be discharged of refrigerant. (Refer
to Section 1B for ÒREFRIGERANT RECOVERYÓ.)
Compressor malfunction will appear in one of four
ways: noise, seizure, leakage or low discharge
pressure. Resonant compressor noises are not
cause for alarm; however, irregular noise or rattles
may indicate broken parts or excessive clearances
due to wear. To check seizure, de-energize the
magnetic clutch and check to see if the drive plate
can be rotated. If rotation is impossible, the
compressor is seized. Low discharge pressure may
be due to a faulty internal seal of the compressor,
or a restriction in the compressor. Low discharge
pressure may also be due to an insufficient
refrigerant charge or a restriction elsewhere in the
system. These possibilities should be checked prior
to servicing the compressor. If the compressor is
inoperative, but is not seized, check to see if current
is being supplied to the magnetic clutch coil
terminals.
The compressor has vanes built into a rotor which
is mounted on a shaft.
When the shaft rotates, the vanes built into the
cylinder block assembly are opened by centrifugal
force.
This changes the volume of the space formed by
the rotor and cylinder, resulting in the intake and
compression of the refrigerant gas. The discharge
valve and the valve stopper, which protects the
discharge valve, are built into the cylinder block
assembly. There is no suction valve but a shaft seal
is installed between the shaft and head; a trigger
valve, which applies back pressure to the vanes, is
installed in the cylinder block and a refrigerant gas
temperature sensor is installed in the front head.
The specified quantity of compressor oil is
contained in the compressor to lubricate the various
parts using the refrigerant gas discharge pressure.
6VD1 engine is equipped with an invariable
capacity five-vane rotary compressor (DKV-14D
Type).
The compressor sucks and compresses refrigerant
by the rotation of the vane installed to the shaft,
and always discharges a fixed amount of refrigerant
independent of the load of refrigerant.The thermo sensor is installed to the front head of
the compressor to protect it by stopping its
operation when the refrigerant gas is insufficient or
when the temperature get abnormally high.
·OFF ..... 160 ±5¡C (320.0 ±9.0¡F)
·ON ..... 135 ±5¡C (275.0 ±9.0¡F)
4JG2 Engine are provided with a swash plate type
compressor (DKS-15CH Type)
Swash plate compressors have a swash (slanted)
plate mounted on the shaft. When the shaft turns,
the rotation of the swash plate is converted to
reciprocating piston motion which sucks in and
compresses the refrigerant gas.
Shaft seal (Lip type) is installed between the valve
plate and shaft & cylinder head to prevent
refrigerant gas leaks. A specified amount of
compressor oil is contained in the oil pan.
This oil is supplied to the cylinders, bearings, etc.,
by an oil pump which is connected to the swash
plate shaft.
With some compressors the differential between
the intake pressure and discharge pressure
generated while the compressor is operating is
used for lubrication instead of an oil pump.
Three pistons are arranged at 120g intervals around
the center of the swash plate shaft. These pistons
are connected to the ends of the swash plate
through shoe disks and balls.
The rotation of the swash plate causes
reciprocating movement of the piston inside the
cylinders, with each piston operating as two
cylinders. Because of that, the compressor operates
as though it has 6 cylinders.
The specified amount of the compressors oil is
150cc (4.2 Imp fl oz).
Also, compressor oil to be used varies according to
the compressor model. Be sure to avoid mixing two
or more different types of oil.
If the wrong oil is used, lubrication will be poor and
the compressor will seize or malfunction.

COMPRESSOR OVERHAUL 1D Ð 5
Checking and Adjusting for Compressor
Replacement
150cc (4.2 Imp fl oz) of oil is charged in compressor
(service parts). So it is necessary to drain the proper
amount of oil from the new compressor.
1) Perform oil return operation.
2) Discharge refrigerant and remove the
compressor.
3) Drain the compressor oil and measure the
extracted oil.
4) Check the compressor oil for contamination.
5) Adjust oil level as required.
Amount of oil drained Draining amount of oil
from used compressor from new compressor
less than Same as drained
90cc (2.5 Imp fl oz) amount
more than
90cc (2.5 Imp fl oz)
90cc (2.5 Imp fl oz)
6) Evacuate, charge and perform oil return
operation.
7) Check system operation.
CONTAMINATION OF COMPRESSOR OIL
Unlike engine oil, no cleaning agent is added to the
compressor oil. Even if the compressor runs for a
long period of time (approximately 1 season), the
oil never becomes contaminated as long as there is
nothing wrong with the compressor or its method
of use.
Inspect the extracted oil for any of the following
conditions:
·The capacity of the oil has increased.
·The oil has changed color to red.
·Foreign substances, metal powder, etc., are
present in the oil.
If any of these conditions exists, compressor oil is
contaminated. Whenever contaminated
compressor oil is discovered, the receiver/drier
must be replaced.
OIL RETURN OPERATION
There is close affinity between the oil and the
refrigerant. During normal operation, part of the oil
recirculates with the refrigerant in the system.
When checking the amount of oil in the system, or
replacing any component of the system, the
compressor must be run in advance for oil return
operation. The procedure is as follows:
1) Open the all doors and engine hood.
2) Start the engine and A/C switch is ÒONÓ and
Set the fan control knob at its highest position.
3) Run the compressor for more than 20 minutes
between 800 and 1,000 rpm in order to operate
the system.
4) Stop the engine.
REPLACEMENT OF COMPONENT PARTS
When replacing system component parts, supply
the following amount of oil to the component parts
to be installed.
Component parts to be installed Amount of oil
Evaporator 50cc (1.4 Imp fl oz)
Condenser 30cc (0.8 Imp fl oz)
Receiver/drier 30cc (0.8 Imp fl oz)
871RX013