Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 536
1A–12 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Chart “E” Blower Motor Dose Not Run At High Position
Step
Action
Yes
No
1
Is resistor OK?
Go to Step 2
Replace
2
Is fan control knob (Fan Switch) OK?
Open circuit
between Chassis
side connector
terminal No. I41-3
and No. I18-6.
Replace control
lever assembly.
Chart “F” Blower Motor Does Not Stop In The “OFF” Position
Step
Action
Yes
No
1
Is the fan control knob (Fan Switch) OK?
Short circuit
between chassis
side connector
terminal No. B5-2
and
No. I41-2,No. I41
-3 and No. I18-6,
No. I41-6 and
No. I18-3,
No. I41-4 and
No. I18-5 or
No. I41-1 and
No. I18-2
Replace control
lever assembly.
Individual Inspection
Blower Motor
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 the negative to the
No. 2.
3. Be sure to check to see if the blower motor operates
correctly.
873RS005
Resistor
1. Disconnect the resistor (I-41) connector.
2. Check for continuity and resistance between the
terminals of the resistor.
840R200011
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–13
Fan switch
position
Resistor terminals
with continuity
Resistance
1
1 — 2
2.4
W
2
2 — 4
0.90
W
3
2 — 6
0.28
W
4
2 — 3
—
Fan Control Knob (Fan Switch)
1. Check for continuity between the terminals of the fan
switch.
865RS001
Fan switch
position
Switch connector terminals with con-
tinuity
OFF
No continuity
1
1 – 2 – 4
2
1 – 4 – 5
3
1 – 3 – 4
4
1 – 4 – 6
Heater & A/C Relay
1. Disconnect the heater and the A/C relay (B-36).
D
When removing the connector for relay, unfasten
the tang lock of the connector by using a
screwdriver, then pull the relay (1) out.
825RS001
2. Check for continuity between the heater and the A/C
relay (B-36) terminals.
825RS002
Condition
Relay terminals with
continuity
Normal
1 – 3 (Approx 85–105
W
)
When battery voltage is
applied between 1 – 3
2 – 4
1A–14 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Heater Unit
Heater Unit and Associated Parts
860RY00005
Legend
(1) Instrument Panel Assembly
(2) Instrument Panel Center Bracket
(3) Resistor
(4) Duct
(5) Evaporator Assembly (A/C only)
(6) Rear Heater Duct
(7) Heater Unit Assembly
(8) Center Ventilation Lower Duct
(9) Driver Lap Vent Nozzle
(10) Water Hose
(11) Electro Thermo Connector (With A/C)
(12) Resistor Connector
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–15
Removal
1. Disconnect the battery ground cable.
2. Drain the engine coolant.
3. Discharge and recover refrigerant (with air
conditioning)
D
Refer to Refrigerant Recovery in this section.
4. Remove the Instrument panel assembly.
D
Refer to Instrument Panel Assembly in Body and
Accessories section.
5. Disconnect the water hoses at the heater unit.
6. Disconnect resistor connector.
7. Remove duct.
8. Remove evaporator assembly (A/C only).
D
Refer to Evaporator Assembly in this section.
9. Remove instrument panel center bracket.
D
Refer to Cross Beam Assembly in Body and
Accessories section.
10. Remove rear heater duct.
11. Remove heater unit assembly.
12. Remove driver lap vent nozzle.
13. Remove center ventilation lower duct.
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.
2. Adjust the control lever assembly cables.
D
Refer to Control Lever Assembly in this section.
3. When installing the heater unit, defroster nozzle and
center vent duct, be sure that the proper seal is made,
without any gap between them.
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