1998 ISUZU TROOPER Service Repair Manual

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Page 97 of 3573

ISUZU TROOPER 1998 Service Repair Manual When the engine warming up, the warmed engine
coolant is sent out into the heater core. The heater
system supplies warm air into the passenger
compartment to warm it up.
Outside air is circulated thro

Page 98 of 3573

ISUZU TROOPER 1998 Service Repair Manual This illustration is based on LHD
Temperature control knob
A/C switch (W/A/C)
TEMP
A/C
Fan control knob(Fan switch) Air source select lever Air select knob
HEATING AND VENTILATION 1A Ð 3
The vehicle

Page 99 of 3573

ISUZU TROOPER 1998 Service Repair Manual 1A Ð 4 HEATING AND VENTILATION
AIR SELECT KNOB
The air selector knob allows you to direct heated air
into the passenger compartment through different
outlets.
1.Vent- In this position, air is dischar

1A Ð 4 HEATING AND VENTILATION
AIR SELECT KNOB
The air selector knob allows you to direct heated air
into the passenger compartment through different
outlets.
1.Vent- In this position, air is discharged from
the upper air outlet. Air quantity is controlled
by the fan control knob.
2.Bi-Level- In this position, air flow is divided
between the upper air outlets and the foot air
outlets, with warmer air delivered to the floor
outlets than the air delivered to the upper air
outlets.
3.Foot- In this position, air flow is delivered to
the foot while sending approx. 30% of total
amount of air to the windshield
4.Def/Foot- In this position, air flow is delivered
to the foot, while sending approx. 40% of total
amount of air to the windshield.
5.Defrost- In this position, most of the air is
delivered to the windshield and a small
amount is delivered to the side windows.
Moving the air source select lever to the ÒCIRCÓ
position provides quickest heat delivery by closing
the blower assembly mode door. In this position,
outside air is not delivered to the passenger
compartment.
AIR SOURCE SELECT LEVER
The intake of outside air and the circulation of inside
air are controlled by sliding this lever left or right.
FAN CONTROL KNOB
This knob controls the blower motor speed to
regulate the amount of air delivered to the defrost,
foot, and ventilation ducts:
1. Low
2. Medium Low
3. Medium High
4. High
TEMPERATURE CONTROL KNOB
When the temperature control knob is in the
ÒCOLDÓ position, the air mix door closes to block
the flow of air to the heater core.
When the temperature control knob is in the
ÒHOTÓ position, the air mix door opens to allow air
to pass through the heater core and heat the
passenger compartment.
Placing the knob in an intermediate position will
cause a lesser or greater amount of air to reach the
heater core. In this mode the passenger compart-
ment temperature can be regulated.
Heater core Heater unit
TO VENT OUTLETAir mix door
VENT MODETO FOOT TO VENT OUTLET
BI-LEVEL MODE
FOOT MODE TO FOOT OUTLET
TO DEF OUTLET(LHD)
DEF/FOOT MODE TO FOOT OUTLETTO DEF OUTLETDEF MODE TO DEF OUTLET
: COLD AIR
: HOT AIR
: TEMP.CONTROLLED AIR

Page 100 of 3573

ISUZU TROOPER 1998 Service Repair Manual Full hot switch Ceramic heater Heater unit
HEATING AND VENTILATION 1A Ð 5
CERAMIC HEATER
When the fan control knob (fan switch) turns on with the temperature control knob set to ÒFULL HOTÓ (full
h

Page 101 of 3573

ISUZU TROOPER 1998 Service Repair Manual 1A Ð 6 HEATING AND VENTILATION
ON-VEHICLE SERVICE
HEATER UNIT
4a
5
3
4
2
6
9
8
7
1Electro thermo connector (With A/C)
Resistor
Removal Steps
1. Instrument panel assembly
2. Water hose
3. Resistor con

Page 102 of 3573

ISUZU TROOPER 1998 Service Repair Manual HEATING AND VENTILATION 1A Ð 7
INSTALLATION
To install, follow the removal steps in the reverse order,
noting the following points:
1. When handling the ECM and the control unit, be
careful not to

Page 103 of 3573

ISUZU TROOPER 1998 Service Repair Manual 1A Ð 8 HEATING AND VENTILATION
Removal Steps
1. Heater unit
2. Duct
3. Case (Mode control)
4. Case (Temperature control)
5. Heater core
6. Mode door
Installation Steps
To install, follow the removal

Page 104 of 3573

ISUZU TROOPER 1998 Service Repair Manual HEATING AND VENTILATION 1A Ð 9
REMOVAL
Preparation:
·Disconnect the battery ground cable
·Drain engine coolant
1. Heater Unit
Refer to ÒHEATER UNITÓ removal procedure in this
section.
2. Duct

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