1995 ISUZU TROOPER Workshop Manual

CONTROL LEVER ASSEMBL V
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.
HEATING AND VENTILATION 1A-3
The fan control is used to control the amount of air
sent
out by the registor at four levels from "LOW"
to "HIGH".
Temperature control knob Air source select lever Air select knob
A/C switch (WI A/C) Fan control knob (Fan switch)
A/C-Air Conditioning
Fig. 1A-2
,__,.. 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.
Fig. 1A-3

1A-4 HEATING AND VENTILATION
AIR SELECT KNOB
The air select knob allows you to direct heated air
into the passenger
compartment through different
outlets (Fig. 1A-4).
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 only.
4. Def/Foot -In this position, air flow is delivered
to the foot, while sending approx. 30% 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.
Heater unit
D
Heater core TO FOOT
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.
.r.( /
<_;~~
'--'R!I=---_____.J'
TO FOOT OUTLET
VENT MODE 81-LEVEL MODE FOOT MODE
TO FOOT OUTLET
DEF/FOOT MODE DEF MODE
Fig. 1A-4
<==:J : COLD AIR
~: HOTAIR
~ : TEMP.CONTROLLED AIR
I ........................................................................\
...... ------------------~1

~~[II] BODY ENG. FRAME
HEATING AND VENTILATION 1A-5
WIRING DIAGRAM
aw
RELAY;
RESTART
1.258
I 8-1el BODY-LH
0.58 2LJ8
BLOWER RESISTOR
r------'2::.::8:,__ __ _,H-201~4 ____ __,2""8 _____ __,
~ BODY-RH
AJC: AIR CONDITIONING
Fig. 1A-5

1A-6 HEATING AND VENTILATION
DIAGNOSIS
HEATING CYCLE DIAGNOSIS
TROUBLE POSSIBLE CAUSE CORRECTION
No heating or 1. Blower motor does not run, or • Refer to "FAN CONTROL KNOB (FAN
Insufficient heating.
runs inproperly. SWITCH) DIAGNOSIS".
2. Engine coolant temperature is • Check the engine coolant temperature
low. after warming up the engine and check
the thermostat.
Replace as necessary.
3. Insufficient engine coolant. • Add engine coolant as required .
4. Circulation volume of engine • Check if the water hose to the heater
coolant is insufficient. core is clogged, collapsed or twisted.
Repair
or replace as necessary.
• Check water pump function. Repair or
replace as necessary.
5. Heater core clogged or • Clean or replace as necessary.
collapsed.
6. The heater core is not provided • Repair the temperature control link unit
with air sent from the blower or mode doors.
motor.
• Repair or adjust the control cables.
7. Duct connections defective or • Repair or replace as necessary.
unsealing.
Control lever
moves 1. Cable attaching clip is not • Repair.
but
mode door does correct.
not operate. 2. Link unit of heater unit or blower • Repair.
assembly defective.
The
mode door 1. Link unit of heater unit or blower • Repair.
cannot
be sent to the assembly defective.
mode
selected. 2. Control cable is not adjustment. • Adjust.
_______ __... ..... ..._ ____________ (

FAN CONTROL LEVER (FAN SWITCH)
DIAGNOSIS
HEATING AND VENTILATION 1A-7
Current flows to the blower motor through the heater
& A!C relay (8-36) to activate the rotation of the
blower motor by turning "ON" the fan control knob
(fan switch).
Blower motor speed is controlled in
stages
by the resistor, by operating the switch from
"LOW" to "HIGH."
I B-361 RELAY;
ji!!J
For the inspection of the relays, switches and units in
each
flow chart, refer to "INDIVIDUAL INSPECTION"
in this section.
1
)
BLOWER MOTOR 2
r-··-··-··
FANSW. I
I
I
I
0 OFF
L= _______ _
~ ~
olJ m 6
I
Blower motor
I does not run.
I Chart "A" I
~
iif1
Fig. 1A-6
Trouble Condition
I
l
Blower motor
does not run
in certain position(s).
I
I Chart "B" I I
BLOWER RESISTOR
I B-361
Eili3 4
IT!!]
rl! 6
AJC: AIR
CONDITIONING
I
Blower motor does not
J stop at "OFF" position.
I Chart "C" I