Isuzu Trooper (1998-2002 year). Service manual — part 7
CAUTION
When fasteners are removed, always
reinstall them at the same location from
which they were removed. If a fastener
needs to be replaced, use the correct part
number fastener for that application. If the
correct part number fastener is not available,
a fastener of equal size and strength (or
stronger) may be used.
Fasteners that are not reused, and those
requiring thread locking compound, will be
called out. The correct torque values must
be used when installing fasteners that
require it. If the above conditions are not
followed, parts or system damage could
result.
HEATING AND VENTILATION 1A – 1
SECTION 1A
HEATING AND VENTILATION
CONTENTS
PAGE
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A– 2
Heater. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A– 2
Control Lever Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A– 3
Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A– 3
Air Select Knob . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A– 4
Air Source Select Lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A– 4
Fan Control Knob . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A– 4
Temperature Control Knob . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A– 4
Ceramic Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A– 5
On-Vehicle Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A– 6
Heater Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A– 6
Heater Core and/or Mode Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A– 8
Heater Mode Control Link Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A–10
Heater Temperature Control Link Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A–12
Blower Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A–14
Blower Link Unit and/or Mode Door. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A–16
Blower Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A–18
Rear Heater Duct, Defroster Nozzle and Ventilation Duct . . . . . . . . . . . . . . . . . . . . 1A–20
Center and/or Side Vent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A–22
Control Lever Assembly and/or Control Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A–24
Control Panel Illumination Bulb. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A–27
Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A–28
Ceramic Heater and/or Full Hot Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A–30
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 through the heater core of
the heater unit and then back into the passenger
compartment. By controlling the mixture of outside
air and heater core air, the most comfortable
passenger compartment temperature can be
selected and maintained.
The temperature of warm air sent to the passenger
compartment is controlled by the temperature
control knob. This knob acts to open and close the
air mix door, thus controlling the amount of air
passed through the heater core.
The air select knob, with its different modes, also
allows you to select and maintain the most
comfortable passenger compartment temperature.
The air source select lever is used to select either
“FRESH” for the introduction of the outside air, or
“CIRC” for the circulation of the inside air. When
the lever is set to “FRESH”, the outside air is always
taken into the passenger compartment. When
setting the lever to “CIRC” position, the circulation
of air is restricted only to the inside air with no
introduction of the outside air and the air in the
passenger compartment gets warm quickened.
However, the lever is normally set to “FRESH” to
prevent the windshield from clouding.
1A – 2 HEATING AND VENTILATION
GENERAL DESCRIPTION
HEATER
Side def hose
Vent box
Upper center vent duct
Lower center
vent duct
Blower assembly
Control lever assembly
Evaporator
assembly
W/A/C
W/O A/C
Duct
Heater unit
Lap vent nozzle
Vent box
Side def hose
Defroster nozzle
Rear heater duct
A/C - Air Conditioning
This illustration is based on LHD
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 – 3
The vehicle has cable-control-type to control by
cable the mode and temperature of the heater unit
and the mode door for the air source of the blower
assembly.
The fan control is used to control the amount of air
sent out by the resistor at four levels from “LOW”
to “HIGH”.
CONTROL LEVER ASSEMBLY
VENTILATION
Set “AIR SOURCE SELECT LEVER” to “FRESH”
position and turn on the blower fan. Heating can be
done in this lever position, sending in fresh air from
outside.
The blower fan also serves to deliver fresh outside
air to the vehicle interior to assure adequate
ventilation.
1A – 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 “CIRC”
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
“COLD” position, the air mix door closes to block
the flow of air to the heater core.
When the temperature control knob is in the
“HOT” 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 OUTLET
Air mix door
VENT MODE
TO FOOT
TO VENT OUTLET
BI-LEVEL MODE
FOOT MODE
TO FOOT OUTLET
TO DEF OUTLET(LHD)
DEF/FOOT MODE
TO FOOT OUTLET
TO DEF OUTLET
DEF MODE
TO DEF OUTLET
: COLD AIR
: HOT AIR
: TEMP.CONTROLLED AIR
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