Isuzu Trooper (2000 year). Manual - part 41

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–133

Power Transistor 

1. Remove the power transistor connector (I–50) from

the evaporator assembly. 

2. Check the conduction between the power transistor

side terminals.

C01RY00002

MAX HI Relay

1. Remove the MAX – HI relay connector (I–51) from the

blower assembly.

2. Check the conduction between the MAX – HI relay

side terminals.

C01RY00003

In Car Sensor

1. Turn on the ignition switch (the engine is started).

Start the air conditioner in “Full Auto”.

2. Make sure that the in car sensor suctions cigarette

smokes and such.

In Car Sensor

1. Dismount the in car sensor from the automatic

heater/air conditioner control unit.  Connect (+) end
and (–) end of the battery to the aspirator motor side
terminals No.I34–1 and No.I34–2, respectively, then
check if the motor runs normally.

C01RY00005

1A–134 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Heater (B–36), Thermostat (X–5), And
Compressor (X–7) Relay

1. Disconnect relays and check for continuity and

resistance between relay terminals.

D

For handling of these relays, refer to Heater Relay
in this section.

901RY00041

Triple Pressure Switch (V6, A/T)

1. Disconnect the connector and check for continuity

between pressure switch side connector terminals (1)
and (2).

2. Reconnect the connector to activate the A/C switch,

and check to see if there is continuity between the
chassis side connector terminal (3) and (4) and the
fan operates.

875RX009

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–135

On-Vehicle Service

Power Transistor

874RY00010

Legend

(1) Evaporator Assembly
(2) Power Transistor
(3) Power Transistor Connector
(4) Instrument Panel Passenger Lower Cover
(5) Glove Box
(6) Front Console
(7) Lower Cluster
(8) Passenger Knee Bolster Reinforcement

Removal

1. Remove front console.
2. Remove lower cluster.
3. Remove glove box.
4. Remove instrument panel passenger lower cover.
5. Remove passenger knee bolster reinforcement.
6. Disconnect the power transistor connector.
7. Remove power transistor.

Installation

To install, follow the removal step in the reverse order.

Automatic Heater/Air Conditioner
Control Unit

865RY00012

Legend

(1) Connector
(2) Set Screw
(3) Instrument Panel Cluster
(4) Automatic Heater/Air Conditioner Control Unit

Removal

1. Disconnect the battery ground cable.
2. Remove instrument panel cluster.

D

Refer to Instrument Panel Assembly in Body
Stractur section.

3. Disconnnect the automatic heater/air conditioner

control unit connector.

4. Remove automatic heater/air conditioner control unit.

Installation

To install, follow the removal step in the reverse order.

1A–136 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

In Car Sensor

865RY00020

Legend

(1) In Car Sensor
(2) Automatic Heater/Air Conditioner Control Unit

Removal

1. Disconnect the battery ground cable.
2. Remove the automatic heater/air conditioner control

unit.

D

Refer to the automatic heater/air conditioner control
unit section.

3. Remove in car sensor.

Installation

To install, follow the removal step in the reverse order.

Ambient Sensor

875RY00001

Legend

(1) Ambient Sensor
(2) Sensor Connector
(3) Radiator Grille

Removal

1. Disconnect the battery ground cable.
2. Remove radiator grille.

D

Refer to Radiator Grille in Body Structure section.

3. Disconnect the ambient sensor connector.
4. Remove the ambient sensor.

Installation

To install, follow the removal step in the reverse order.