heating ISUZU TROOPER 1995 User Guide

HEATING AND VENTILATION 1A-...9
CHART "B"
BLOWER MOTOR DOES NOT RUN IN CERTAIN POSITION
® 1 :(LOW)
BLOWER MOTOR DOES @ 2 : (MEDIUM LOW) POSITION NOT RUN AT © 3 : (MEDIUM HI)
@ 4: (HIGH)
* CHECKING IS PERFORMED ONLY WHEN IN
THE MALFUNCTION MODE.
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• IS RESISTOR OK?
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~ ~
• IS FAN CONTROL KNOB (FAN SWITCH) OK? I REPLACE I
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~ ~
® CONDITION: I REPLACE CONTROL LEVER
• OPEN CIRCUIT BETWEEN CHASSIS SIDE CONNECTOR ASSEMBLY
TERMINAL NO.
B3-1 AND NO. 118-2
@CONDITION:
• OPEN CIRCUIT BETWEEN CHASSIS SIDE CONNECTOR
TERMINAL NO.
B3-4 AND NO. 118-5
©CONDITION:
• OPEN CIRCUIT BETWEEN CHASSIS SIDE CONNECTOR
TERMINAL NO.
B3-6 AND NO. 118-3
@ CONDITION:
• OPEN CIRCUIT
BETWEEN CHASSIS SIDE CONNECTOR
TERMINAL NO.
B3-3 AND NO. 118-6
CHART "C"
BLOWER MOTOR DOES NOT STOP AT "OFF" POSITION
• IS FAN CONTROL KNOB (FAN SWITCH) OK?
I
SHORT CIRCUIT BETWEEN CHASSIS SIDE
CONNECTOR TERMINAL
• NO.
B5-2 AND NO. B3-2
(OR)
• NO. B3-3 AND NO. 118-6
(OR)
• NO. B3-6 AND NO. 118-3
(OR)
• NO. B3-4 AND NO. 118-5
(OR)
• NO. B3-1 AND NO. 118-2
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REPLACE CONTROL LEVER
ASSEMBLY
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I

1A-10 HEATING AND VENTILATION
~ INDIVIDUAL INSPECTION
BLOWER MOTOR (Fig. 1A-7)
1. Disconnect the blower motor (B-5) connector
from the blower motor.
2. Connect the battery positive terminal to the No.
1 terminal of the blower motor and negative to
the No.2.
3. Be sure to check to see if the blower motor
operates correctly.
Fig. 1A-7
RESISTOR (Fig. 1A-8)
1. Disconnect resistor (B-3) connector.
2. Check for continuity and resistance between the
terminals of the resistor.
Motor 4 3 2
(SW. position)
Terminal Normal
SW No.
2 3 4 6 Operating
position Resistance
1 2.4Q
2 0.90Q
3 0.28Q
4
Fig. 1A-8
FAN CONTROL KNOB (FAN SWITCH)
(Fig. 1A-9)
1. Check for continuity between the terminals of
the fan switch.
Connector terminal
2 3 4 5 6
OFF
1
2
3
4
Fig. 1A-9
HEATER & A/C RELAY
1. Disconnect heater & A!C relay (B-36).
• When removing the connector for relay,
unfasten the tang lock of the connector by
using a screwdriver, then pull the relay out
(Fig. 1A-10).
Fig. 1A-10
2. Check for continuity between heater & A!C relay
(B-36) terminals (Fig. 1A-11).
~
•

CD-@: .. Continuity (Approx. 85-105 n l
(When battery
voltage is applied between CD-@)
®-@ ... Continuity
Fig. 1A-11
HEATING AND VENTILATION 1A -11
ON-VEHICLE SERVICE
HEATER UNIT
A/C -Air Conditioning
Electronic thermostat
connector(W I A/C)
Removal steps 1. Water hose 2. Instrument panel assembly
3. Resistor connector
4. Duct 4a. Evaporator assembly (AJC only)
5. ECM and/or control unit 6. Instrument panel stay 7. Front console 8. Rear heater duct 9. Heater unit
Installation steps
To
install, follow the removal
steps in the reverse order.
Fig. 1A-12
1••1 REMOVAL
Preparation:
Disconnect the battery ground cable
Drain engine coolant
Discharge and recover refrigerant (W/Air
conditioning)
(Refer to Section 1 B "REFRIGERANT RE­
COVERY")
1. Water hose
• Disconnect water hoses at heater unit.
2.
Instrument panel assembly
• Refer to Section 10 "BODY" for INSTRU­
MENT PANEL ASSEMBLY removal pro­
cedure.
3. Resistor
connector
4. Duct

1A ";" 12 HEATING AND VENTILATION
4a. Evaporator assembly
• Refer to Section 1 B "AIR CONDITIONING" for
Evaporator Assembly removal procedure.
5. ECM and/or control unit
• Do not disconnect ECM and control unit
connectors.
6. Instrument panel stay
7. Front console
8. Rear heater duct
9. Heater unit
HEATER CORE AND/OR MODE DOOR
3
1

5
2 6
4
I••! 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 make any improper connection of
the connectors.
2. Adjust control lever assembly cables.
FEI • Refer to "CONTROL LEVER ASSEMBLY"
-installation steps in this section.
3. When installing the heater unit, defroster nozzle
and center vent duct, be sure that proper seal is
made,
without any gap between then.
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 steps
in the reverse order.
Fig. 1A-13
..

1••1 REMOVAL
Preparation:
Disconnect the battery ground cable
Drain engine coolant
1. Heaterunit
• Refer to "HEATER UNIT" removal procedure
in
this section.
2. Duct
3. Case (Mode control)
• Do not remove link unit at this step.
4. Case (Temperature control)
• Separate two halves of core case (Fig. 1A-14).
Fig. 1A-14
5. Heater core (Fig. 1A-15)
Fig. 1A-15
HEATING AND VENTILATION 1A-13
6. Mode door
• Pull out the mode door while raising up the
catch
of the door lever (Fig. 1A-16).
Fig. 1A-16
(b!] INSPECTION
Check for foreign matter in the heater core, stain or
the core fin defacement.
l••liNSTALLATION
To install, follow the removal steps in the reverse
order,
noting the following point:
1. Check that each mode door operates properly.

1A-14 HEATING AND VENTILATION
HEATER MODE CONTROL LINK UNIT
2 1
Removal
steps 1. Heater unit 2. Case (Mode control)
3. Washer and mode main lever
4. Rod 5. Mode sub-lever 6. Door lever 7. Clip
Installation
steps
To install, follow the removal steps --------' in the reverse order.
Fig. 1A-17
1••1 REMOVAL
Preparation:
Disconnect the battery ground cable
Drain engine coolant
1. Heater unit
• Refer to "HEATER UNIT" removal procedure
in
this section.
2. Case (Mode control)
•
Remove the case (Mode control) from heater
unit.
3. Washer and mode main lever
4. Rod
5. Mode sub-lever
•
Press the tab of the sub-lever inward, and take
out the sub-lever (Fig. 1A-18).
6. Door lever
• Pull
out the door lever while raising up the
catch
of the door lever (Fig. 1A-16).
7. Clip
I••! INSTALLATION
To install, follow the removal steps in the reverse
order, noting the following points:
1~1 1. Apply grease to mode sub-lever and to the
abrasive surface
of the heater unit.
IL•I 2. After installing the link unit, check to see ifthe
link unit operates correctly.
Fig. 1A-18
•

HEATING AND VENTILATION 1A-15
HEATER TEMPERATURE CONTROL LINK UNIT
5
6
/ /
I I
)
1
Removal steps Installation steps 1. Heater unit 2. Case (Temperature control) To install, follow the removal steps in the
reverse order.
3. Rod 4. Sub-lever
5. Door lever 6. Clip
Fig. 1A-19
1••1 REMOVAL
Preparation:
Disconnect the battery ground cable
Drain engine coolant
1. Heater unit
• Refer to "HEATER UNIT" removal procedure
in this section.
2. Case (Temperature control)
• Remove the case (Temperature control) from
the heater unit.
3. Rod
4. Sub-Lever (Fig. 1A-18)
5. Door Lever
• Pull out the door lever while raising up the
catch of the door lever (Fig. 1A-16).
6. Clip
I••! INSTALLATION
To install, follow the removal steps in the reverse
order,
noting the following points:
1~1 1. Apply grease to sub-lever and to the abrasive
surface
of the heater unit.
I L•l 2. After installing the link unit, check to see if the
link unit operates correctly.

1A-16 HEATING AND VENTILATION
BLOWER ASSEMBLY
Cross beam assembly
Removal steps
1. Instrument panel assembly 2. Resistor connector
3. Duct 3a. Evaporator assembly
lAIC only)
4. Blower motor connector 5. Blower assembly
Installation
steps
To install, follow the removal steps in the reverse order.
A/C -Air Conditioning Heater
unit
Electronic thermostat connector (W A/C)
5
3
3a
Fig.
1A-20
1+•1 REMOVAL
Preparation:
Disconnect the battery ground cable
Discharge and recover refrigerant (W/Air
conditioning)
(Refer to Section 1B "REFRIGERANT RE­
COVERY")
1. Instrument panel assembly
• Refer to Section 10 "BODY" for INSTRUMENT
PANEL ASSEMBLY removal
procedure.
2. Resistor connector
3. Duct
3a. Evaporator Assembly (A/C only)
• Refer to Section 1B "AIR CONDITIONING" for
EVAPORATOR ASSEMBLY removal proce­
dure.
4. Blower motor connector
5. Blower assembly
I••IINSTALLATION
To install, follow the removal steps in the reverse
order,
noting the following point:
1. Adjust control lever assembly cables
r:C1 • Refer to "CONTROL LEVER ASSEMBLY"
L.:D installation procedure in this section.

HEATING AND VENTILATION 1A -17
BLOWER LINK UNIT AND/OR MODE DOOR
Removal steps 1. Blower assembly 2. Lower case
3. Upper case 4. Mode door 5. Sub lever 6. Door lever
Installation steps
To install, follow the removal steps
in the reverse order.
Fig. 1A-21
1++1 REMOVAL
Preparation:
Disconnect the battery ground cable
1. Blower Assembly
• Refer to "BLOWER ASSEMBLY" removal
procedure in this section.
2. Lower Case
3. Upper Case
• Separate upper case and slit the lining parting
face with a knife (Fig. 1A-22).
4. Mode door
• Pull out the mode door while raising up the
catch ofthe door lever (Fig. 1A-16).
5. Sub lever
6. Door lever
Fig. 1A-22
I••IINSTALLATION
To install, follow the removal steps in the reverse
order,
noting the following points:
r:::::::l 1. Apply grease to the door lever and to the
D abrasive surface of the upper case.
~~I 2. Apply an adhesive to parting face of lining
when assembling upper case.

1A-18 HEATING AND VENTILATION
BLOWER MOTOR
I I I I
L_ -----------___ _j
Removal steps
1. Blower motor connector
2. Attaching screw
3. Blower motor assembly
4. Clip
5. Fan
6. Blower mater
Installation steps
To install, follow the removal
steps in the reverse order.
Fig. 1A-23
B REMOVAL 8 INSTALLATION
Preparation:
• Disconnect battery ground cable.
1. Blower moter connector
2. Attaching screw
3. Blower motor assembly
4. Clip
5. Fan
6. Blower moter
To intall, follow the removal steps in the reverse
order.