Isuzu Trooper (2000 year). Service manual - part 29

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–85

D08RY00155

1A–86 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

D08RY00147

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–87

D08RY00148

1A–88 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Functions and Features

Automatic interior temperature control

This function enables to maintain the interior

temperature at the level specified from the
temperature control switch despite of changes in
factors such as vehicle speeds, outside air
temperature and number of passengers.

Maximum cooling and heating function

You can select FC (Full cool, namely maximum cooling

temperature) or FH (Full heat, maximum heating
temperature) from the temperature control lever.

Automatic air flow control

Air flow is automatically and consecutively fine tuned

according to the specified interior temperature and
changes in aperture of  the heater unit mix door.

Mode (blow port) control

This function automatically selects either one of the

VENT, BI-LEVEL, FOOT or DEF mode for the blow
port according to changes of temperature on the
blow port.  Using the mode switch allows you to
select a desired blow port manually.

Intake (switching between the fresh air intake and
circulation of interior air) control

The intake (switching between fresh air intake and

circulation of interior air) mode automatically selects
either FRESH (fresh air intake), MIX or RECIRC
(interior air circulation) according to changes of the
blow port temperature.  Using the intake switch
allows you to select a desired intake port manually
(in the manual operation, FRESH and RECIRC
modes alone are available).  Pressing the DEF
(defrost) mode switch selects the FRESH (fresh air
intake).

Cooler start-up timing control

This function is used for maintaining the air flow  at

“LOW” level until the evaporator is sufficiently
cooled down.  It is intended  to prevent a large
volume of hot air being blowing into inside of a
vehicle when the cooler is turned on in hot summer
season.

Heater start-up timing control

This function is used for maintained the air flow at

“LOW” level and also for maintaining the defrost
mode until temperature of coolant in the heater core
is sufficiently heated.  It is intended to prevent a
large volume of cool air being blown into inside of a
vehicle when the heater is turned on in cold winter
season.

Solar radiation quantity offset control

The photodiode on the sun sensor determines solar

radiation quantity accurately to offset interior
temperature quickly.

Switch position storing function

This function is used for storing switch positions being

selected in the immediately preceding operation,
namely the last time the ignition has been turned off.
It simplifies the setup procedures when restarting

the system.

Self-diagnosis function

The self-diagnosis function turned on from the panel

switch makes your troubleshooting easier (for detail
of this function, refer to the section titled
“Self-Diagnosis”).