ISUZU AXIOM 2002 Service Owner's Guide

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±5
C01RW001
Air Source Select Switch
Press this button to select either Fresh Air Intake or CIRC
(inside air circulation). There is an indicator light inside the
button. This light indicates that the CIRC mode is ªONº.
Fresh Air Intake is the default setting for both DEFROST
and FOOT/DEFROST.
Fan Control Switch
This switch controls the blower motor speed to regulate
the amount of air delivered to the defrost, foot, and
ventilation ducts:
1. L0
2. M1
3. M2
4. M3
5. HI
Temperature Control Switch
When the temperature control switch is in the ª18
C
(65
F)º position, the air mix door closes to block the air
flow to the heater core.
When the temperature control switch is in the ª32
C
(90
F)º position, the air mix door opens to allow air to pass
through the heater core and heat the passenger
compartment.
Selecting the desired temperature will control the air flow
through the heater core, allowing control of the cabin
temperature.

1A±6
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Heater Unit
Heater Unit and Associated Parts
840R200008
Legend
(1) Instrument Panel Assembly
(2) Cross Beam Assembly
(3) Instrument Panel Bracket W/Suspension
Control Unit
(4) Ventilation Lower Duct(5) Rear Heater Duct
(6) Evaporator Assembly
(7) Heater Unit Assembly
(8) Heater Hose
(9) Power Transistor Connector
Removal
1. Disconnect the battery ground cable.
2. Drain the engine coolant.
3. Discharge and recover refrigerant (with air
conditioning).

Refer to
Refrigerant Recovery in this section.
4. Remove the Instrument panel assembly.

Refer to
Instrument Panel Assembly in Body and
Accessories section.
5. Remove instrument panel bracket w/suspension
control unit.

Refer to
Cross Beam Assembly in Body and
Accessories section.
6. Cross Beam Assembly.

Refer to
Cross Beam Assembly in Body and
Accessories section.
7. Disconnect power transistor connector.
8. Remove evaporator assembly.

Refer to
Evaporator Assembly in this section.
9. Remove ventilation lower duct.
10. Remove rear heater duct.

Remove foot rest, carpet and 3 clips.
11. Disconnect mode/mix actuator connector.
12. Remove heater unit assembly.

Disconnect heater hoses at heater unit.
Installation
To install, follow the removal steps in the reverse order,
noting the following points:
1. When handling the PCM and the control unit, be
careful not to make any improper connection of the
connectors.

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±7
2. When installing the heater unit, defroster nozzle and
center vent duct, be sure that the proper seal is made,
without any gap between them.
Heater Core and / or Mode Door
Disassembled View
860R200001
Legend
(1) Heater Core
(2) Case (Temperature Control)
(3) Heater Unit
(4) Mix Actuator(5) Mode Door
(6) Duct
(7) Mode Actuator
(8) Case (Mode Control)

1A±8
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Removal
1. Disconnect the battery ground cable.
2. Drain the engine coolant.
3. Discharge and recover refrigerant (with air
conditioning).

Refer to
Refrigerant Recovery in this section.
4. Remove heater unit.

Refer to
Heater Unit in this section.
5. Remove duct.
6. Remove mix actuator.
7. Remove mode actuator.
8. Remove case (Mode control) and do not remove link
unit at this step.
9. Remove case (Temperature control) separate two
halves of core case.
860RS002
10. Remove heater core (1).
860RS003
11. Pull out the mode door while raising up the catch of
the door lever.
860RS004
Inspection
Check for foreign matter in the heater core, stain or the
core fin defacement.
Installation
To install, follow the removal steps in the reverse order,
noting the following point:
1. Check that each mode door operates properly.

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±9
Heater Mode Control Link Unit
Disassembled View
860R200002
Legend
(1) Case (Mode Control)
(2) Heater Unit
(3) Mode Sub-lever
(4) Clip(5) Door Lever
(6) Rod
(7) Mode Actuator
(8) Washer and Mode Main Lever
Removal
1. Disconnect the battery ground cable.
2. Drain engine coolant.
3. Discharge and recover refrigerant (with air
conditioning)

Refer to
Refrigerant Recovery in this section.
4. Remove heater unit.

Refer to
Heater Unit in this section.
5. Remove mode actuator.
6. Remove the case (Mode control) from heater unit.
7. Remove washer and the mode main lever.
8. Remove rod.
9. Press the tab of the sub-lever inward, and take out the
sub-lever.
860RS006

1A±10
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
10. Pull out the door lever while raising up the catch of the
door lever.
11. Remove clip.
Installation
To install, follow the remove steps in the reverse order,
noting the following points:
1. Apply grease to the mode sub-lever and to the
abrasive surface of the heater unit.
2. After installing the link unit, check to see if the link unit
operates correctly.

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±11
Heater Temperature Control Link Unit
Disassembled View
860R200003
Legend
(1) Case (Temperature control)
(2) Door Lever
(3) Clip
(4) Rod(5) Clip
(6) Sub-lever
(7) Mix Actuator
(8) Heater Unit
Removal
1. Disconnect the battery ground cable.
2. Drain engine coolant.
3. Discharge and recover refrigerant (with air
conditioning).

Refer to
Refrigerant Recovery in this section.
4. Remove heater unit.

Refer to
Heater Unit in this section.
5. Remove mix actuator.
6. Remove the case (Temperature control) from the
heater unit.
7. Remove rod.
8. Remove sub-lever.
9. Pull out the door lever while raising up the catch of the
door lever.
10. Remove clip.
Installation
To install, follow the removal steps in the reverse order,
noting the following points:
1. Apply grease to the sub-lever and to the abrasive
surface of the heater unit.
2. After installing the link unit, check to see if the link unit
operates correctly.

1A±12
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Blower Assembly
Blower Assembly and Associated Parts
873R200004
Legend
(1) Instrument Panel Assembly
(2) Blower Assembly(3) Evaporator Assembly
(4) Heater Unit
Removal
1. Disconnect the battery ground cable.
2. Discharge and recover refrigerant (with air
conditioning).

Refer to
Refrigerant Recovery in this section.
3. Remove instrument panel assembly.

Refer to
Instrument Panel Assembly in Body and
Accessories section.
4. Disconnect power transistor connector.
5. Remove evaporator assembly.

Refer to
Evaporator Assembly in this section.
6. Disconnect blower motor/intake actuator connector.
7. Remove blower assembly.
Installation
To install, follow the removal steps in the reverse order.

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±13
Blower Link Unit and / or Mode door
Disassembled View
873R200001
Legend
(1) Blower Assembly
(2) Upper Case
(3) Mode Door
(4) Lower Case(5) Max High Relay
(6) Intake Actuator
(7) Sub Lever
(8) Door Lever
Removal
1. Disconnect the battery ground cable.
2. Discharge and recover refrigerant (with air
conditioning).

Refer to
Refrigerant Recovery in this section.
3. Remove blower assembly.

Refer to
Blower Assembly in this section.
4. Remove intake actuator.
5. Remove max high relay.
6. Remove lower case.
7. Separate the upper case and slit the lining parting
face with a knife.
873RS002

1A±14
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
8. Pull out the mode door while raising up the catch of
door lever.
9. Remove sub-lever.
10. Remove door lever.
Installation
To install, follow the removal steps in the reverse order,
noting the following points:
1. Apply grease to the door lever and to the abrasive
surface of the upper case.
2. Apply an adhesive to the parting face of the lining
when assembling the upper case.