1998 ISUZU TROOPER heater

AIR CONDITIONING 1BÐ123
Inspection of the Air Conditioner Room Temperature Setup System
¥ Conflicts Between the Set Temperature and Actual Room Temperature
NOReplace the failed sensor.
NO
NO
Failure on the automatic heater/air
conditioner control unit.
YES YESYES
Is the in car sensor intaking the room
air? (Refer to the later section on "Check
Up".)
Is the air mix link properly attached?
(Make sure that selecting FH or FC using
the lever respectively sets the mix door
to the full hot or full cool.)
Are the interior temperature sensor and
the outside air temperature sensor
functioning normally?
Failure on the in car sensor.
Failure on the air mix link or the actuator.

AIR CONDITIONING 1BÐ125
Power Transistor
1. Remove the power transistor connector (I-47)
from the evaporator assembly.
2. Check the conduction between the power
transistor side terminals.
MAX HI Relay
1. Remove the MAX HI relay connector (B-64) from
the blower assembly.
2. Check the conduction between the MAX HI relay
side terminals.In Car Sensor
1. Turn on the ignition switch (the engine is
started). Start the air conditioner in "Full Auto".
2. Make sure that the in car sensor suctions
cigarette smokes and such.
3. Dismount the in car sensor from the automatic
heater/air conditioner control unit. Connect (+)
end and (-) end of the battery to the aspirator
motor side terminals No.1 and No.2
, respectively, then
check if the motor runs normally.I-34
I-34














"650
4321
C01RW020
43
3 41
2 21
No continuity between terminals (2) and (4).
Continuity between terminal (2) and (4) when battery
voltage is applied between (1) and (3).
C01RY00003
1
2
3
Terminal
No.Conduction
Conducted (50½ maximum)
Conducted (100½ maximum)
Conducted (220½ maximum) Not conducted
Not conducted 1
µ23
Testing
rod
µ
µ
µ
µ
´
´
´
´
´
1 23
C01RY00002

1BÐ126 AIR CONDITIONING
ON-VEHICLE SERVICE
Power Transistor
Legend
(1) Evaporator Assembly
(2) Passenger Knee Bolster Reinforcement
(3) Lower Cluster
(4) Front Console
(5) Glove Box
(6) Instrument Panel Passenger Lower Cover
(7) Power Transistor Connector
(8) Power Transistor
Removal
1. Remove front console.
2. Remove lower cluster.
3. Remove glove box.
4. Remove instrument panel passenger lower
cover.
5. Remove passenger knee bolster reinforcement.
6. Disconnect the power transistor connector.
7. Remove power transistor.
Installation
To install, follow the removal step in the reverse
order.
Automatic Heater/Air Conditioner Control
Unit
Legend
(1) Connector
(2) Automatic Heater / Air Conditioner Control
Unit
(3) Instrument Panel Cluster
(4) Set Screw
Removal
1. Disconnect the battery ground cable.
2. Remove instrument panel cluster.
·Refer to Instrument Panel Assembly in Body
Structure section.
3. Disconnect the automatic heater / air conditioner
control unit connector.
4. Remove automatic heater/ air conditioner
control unit.
Installation
To install, follow the removal step in the reverse
order.
7
6
5
432 81
874RY00001
This illustration is based on RHD















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AIR CONDITIONING 1BÐ127
In Car Sensor
Legend
(1) In Car Sensor
(2) Automatic Heater / Air Conditioner Control
Unit
Removal
1. Disconnect the battery ground cable.
2. Remove the automatic heater / air conditioner
control unit.
·Refer to the automatic heater / air conditioner
control unit section.
3. Remove in car sensor.
Installation
To install, follow the removal step in the reverse
order.
Ambient Sensor
Legend
(1) Ambient Sensor
(2) Sensor Connector
(3) Radiator Grill
Removal
1. Disconnect the battery ground cable.
2. Remove radiator grille.
·Refer to Radiator Grille in Body Structure
section.
3. Disconnect the ambient sensor connector.
4. Remove the ambient sensor.
Installation
To install, follow the removal step in the reverse
order.


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21
865RY00006
12
3
875RY00001

6A±48
ENGINE MECHANICAL
Engine Assembly
Removal
035RW027
1. Disconnect battery ground and positive cable.
2. Remove battery.
3. Make alignment mark on the engine hood and hinges
before removal in order to return the hood to original
position exactly.
4. Remove engine hood.
5. Drain radiator coolant.
6. Disconnect accelerator cable and automatic cruise
control cable from throttle valve on common
chamber.
7. Disconnect air duct with air cleaner cover.
8. Remove air cleaner assembly.
9. Disconnect canister vacuum hose.
10. Disconnect vacuum booster hose.
11. Disconnect three engine harness connectors.
12. Disconnect harness connector to transmission (left
front side of engine compartment), disconnect shift
on the fly harness connector from front side of front
axle and remove transmission harness bracket from
engine left side.
13. Disconnect ground cable between engine and frame.
14. Disconnect bonding cable connector on the back of
right dash panel.
15. Disconnect bonding cable terminal on the left bank.
16. Disconnect starter harness connector from starter.
17. Disconnect generator harness connector from
generator.
18. Disconnect coolant reserve tank hose from radiator.
19. Remove radiator upper and lower hoses.
20. Remove upper fan shroud.
21. Remove cooling fan assembly four fixing nuts, then
the cooling fan assembly.
22. Move drive belt tensioner to loose side using wrench
then remove drive belt.23. Remove power steering pump fixing bolts, then
power steering pump. Place the power steering pump
along with piping on the body side.
24. Remove air conditioning compressor fixing bolts from
bracket and place the compressor along with piping
on the body side.
25. Remove O
2 sensor harness connectors from exhaust
front pipe.
26. Remove three exhaust pipe fixing nuts from each
bank.
27. Remove two exhaust pipe fixing nuts from each
exhaust pipe, then move exhaust pipe to rear side of
vehicle.
28. Remove flywheel dust covers.
29. Disconnect two heater hoses from engine.
30. Disconnect fuel hoses from right side of transmission.
CAUTION: Plug fuel pipes on engine side and fuel
hoses from fuel tank.
31. Remove transmission assembly. Refer to
Transmission section in this manual.
32. Support the engine by engine hoist.
33. Remove two left side engine mount fixing bolts from
engine mount on chassis side.
34. Remove two right side engine mount fixing bolts from
engine mount on chassis side.
35. Remove engine assembly.
Installation
CAUTION: W h e n assembling the engine and
transmission, confirm that dowels have been
mounted in the specified positions at the engine
side. Take care that dowel positions are different
between the manual transmission and the automatic
transmission.

6A±49
ENGINE MECHANICAL
If the engine is assembled in the condition that the
dowels have not been mounted in the specified posi-
tions, the transmission may be damaged the trans-
mission.
012RS009
1. Install engine assembly. Tighten engine mount fixing
bolts to frame to the specified torque.
Torque: 41 N´m (4.2 Kg´m/30 lb ft)
2. Reconnect fuel hose to fuel pipe on engine.
3. Install transmission assembly. Refer to Transmission
section in this manual.
4. Reconnect two heater hoses to engine.
5. Install flywheel dust covers.
6. Install exhaust pipe and temporally tighten two (each
bank) rear exhaust flange nuts then tighten three stud
nuts (each bank) between exhaust manifold and
exhaust pipe, finally tighten rear side nuts to the
specified torque.
Torque:
Nuts: 43 N´m (4.4 Kg´m/32 lb ft)
Stud nuts: 67 N´m (6.8 Kg´m/49 lb ft)
150RW061
Legend
(1) Exhaust Front Pipe RH
(2) O
2 Sensor (for IGM)
150RW062
Legend
(1) Exhaust Front Pipe LH
7. Reconnect O2 sensor connector.
8. Install cooling fan assembly and tighten bolts/nuts to
the specified torque.
Torque : 22 N´m (2.2 Kg´m/16 lb ft) for fan pulley
and fan bracket.
Torque : 10 N´m (1.0 Kg´m/88.5 lb in) for fan and
clutch assembly.

6B±2
ENGINE COOLING
General Description
030RW001
Legend
(1) Water Pump
(2) Thermostat
(3) Radiator
(4) Reserve Tank
(5) Cooling Fan
(6) Cylinder Block(7) Cylinder Head
(8) Right Bank
(9) Throttle Body
(10) Cylinder Block
(11) Cylinder Head
(12) Left Bank
(13) Heater
The cooling system is a pressurized Engine Coolant (EC)
forced circulation type which consists of a water pump,
thermostat cooling fan, radiator and other components.
The automatic transmission fluid is cooled by the EC in
radiator.
Water Pump
The EC pump is a centrifugal impeller type and is driven
by a timing belt.
030RS001

6B±6
ENGINE COOLING
Draining and Refilling Cooling
System
Before draining the cooling system, inspect the system
and perform any necessary service to ensure that it is
clean, does not leak and is in proper working order. The
engine coolant (EC) level should be between the ªMINº
and ªMAXº lines of reserve tank when the engine is cold.
If low, check for leakage and add EC up to the ªMAXº line.
There should not be any excessive deposit of rust or
scales around the radiator cap or radiator filler hole, and
the EC should also be free from oil.
Replace the EC if excessively dirty.
1. Completely drain the cooling system by opening the
drain plug (2) at the bottom of the radiator.
110RW002
2. Remove the radiator cap.
WARNING: T O AV O I D T H E D A N G E R O F B E I N G
BURNED, DO NOT REMOVE THE CAP WHILE THE
ENGINE AND RADIATOR ARE STILL HOT.
SCALDING FLUID AND STEAM CAN BE BLOWN OUT
UNDER PRESSURE.
3. Disconnect all hoses from the EC reserve tank.
Scrub and clean the inside of the reserve tank with
soap and water. Flush it well with clean water, then
drain it. Install the reserve tank and hoses.
4. Refill the cooling system with the EC using a solution
that is at least 50 percent antifreeze but no more than
70 percent antifreeze.
5. Fill the radiator to the base of the filler neck.
Fill the EC reserve tank to ªMAXº line when the engine
is cold.
6. Block the drive wheels and firmly apply the parking
brake. Shift an automatic transmission to ªPº (Park)
or a manual transmission to neutral.
7. Remove the radiator cap. Start the engine and warm
it up at 2,500 ~ 3,000 rpm for about 30 minutes.
8. When the air comes out from the radiator filler neck
and the EC level has gone down, replenish with the
EC. Repeat this procedure until the EC level does not
go down. Then stop the engine and install the radiator
cap. Let the engine cool down.9. After the engine has cooled, replenish with EC up to
the ªMAXº line of the reserve tank.
10. Start the engine. With the engine running at 3,000
rpm, make sure there is no running water sound from
the heater core (behind the center console).
11. If the running water sound is heard, repeat steps 8 to
10.