Isuzu Trooper (2000 year). Service manual - part 9

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

1A–5

Control Lever Assembly

The vehicle has cable-type-control to control 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”.

865RW007

Legend

(1) Air Source Select Lever
(2) Air Select Knob

(3) Fan Control Knob (Fan Switch)
(4) Air Conditioning (A/C) Switch (W/ A/C)
(5) Temperature Control Knob

1A–6

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

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.

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HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

1A–7

Air Select Knob

The air select 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 floor 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% op total amount air to the
wind shield.

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.

Selecting this mode allows air conditioning system to
work when the fan switch is turned to on position,
even if the A/C switch is off.

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.
Selecting this mode allows air conditioning system to
work when the fan switch is turned to on position, even if
the A/C switch is off.

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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 air flow 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 a intermediate position will cause a
lesser or greater amount air to reach the heater core. In
this mode the passenger compartment temperature can
be regulated

1A–8

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Wiring Diagram

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