Isuzu Trooper (2000 year). Service 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.
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