Isuzu Trooper (2000 year). Manual — part 24

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–65

D

When removing the refrigerant line connecting part,
the connecting part should immediately be plugged
or capped to prevent foreign matter from being
mixed into the line.

Installation

To install, follow the removal steps in the reverse order,
noting the following points:

1. O-rings cannot be reused. Always replace with new

ones.

2. Be sure to apply new compressor oil to the O-rings

when connecting lines.

3. Tighten the refrigerant line to the specified torque.

Refer to Main Data and Specifications for Torque
Specifications in this section.

1A–66 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Main Data And Specifications

General Specifications

HEATER UNIT

Temperature control

Reheat air mix system

Capacity

4.3 kw (3,700 Kcal./hr.)

Air flow

280 m

#

/hr

HEATER CORE

Type

Plate and corrugate fin type

Element dimension

171 mm (6.7 in.)

×

161 mm (6.3 in.)

×

25 mm (0.98 in.)

Radiating area

Approx. 0.75 m

@

EVAPORATOR ASSEMBLY

Capacity

4.9 kw (4,200 Kcal./hr.)

Air flow

470 m

#

/hr

EVAPORATOR CORE

Type

Al-laminate louver fin type

Element dimension

235 mm (9.3 in.)

×

225.3 mm (8.9 in.)

×

60 mm (2.4 in.)

EXPANSION VALVE

Type

Internal pressure equalizer type

THERMOSTAT SWITCH

Type

Electronic thermostat

OFF: Below 3.5

±

0.5

°

C (38.3

±

0.9

°

F)

ON: Above 5.0

±

0.5

°

C (41.0

±

0.9

°

F)

CONDENSER

Type

Parallel flow

Radiation performance

15.9 kw (13,700 Kcal./hr.)

RECEIVER/DRIER

Type

Assembly includes sight glass with dual pressure
switch

Internal volume

300 cc (10 fl.oz.)

PRESSURE SWITCH

Type

Dual pressure switch

Low pressure control

ON: 186.3

±

29.4 kPa (27.0

±

4.3 psi)

OFF: 176.5

±

19.6 kPa (25.6

±

2.8 psi)

High pressure control

DIFF: 2353.6

±

196.1 kPa (341.3

±

28.4 psi)

OFF: 2942.0

±

196.1 kPa (426.6

±

28.4 psi)

REFRIGERANT

Type

HFC-134a

Specified amount

600 g (1.32 lbs.)

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–67

Torque Specifications

852RW004

874RX016

1A–68 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Compressor

Service Precaution

WARNING: THIS VEHICLE HAS A SUPPLEMENTAL
RESTRAINT SYSTEM (SRS). REFER TO THE SRS
COMPONENT LOCATION VIEW IN ORDER TO
DETERMINE WHETHER YOU ARE PERFORMING
SERVICE ON OR NEAR THE SRS COMPONENTS OR
THE SRS WIRING. WHEN YOU ARE PERFORMING
SERVICE ON OR NEAR THE SRS COMPONENTS OR
THE SRS WIRING, REFER TO THE SRS ON-VEHICLE
SERVICE INFORMATION. FAILURE TO FOLLOW
CAUTIONS COULD RESULT IN POSSIBLE AIR BAG
DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.

CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specifications. Following these
instructions can help you avoid damage to parts and
systems.

General Description

The HD6/HT6 Automotive Conditioning Compressor and
Clutch Assembly is a light weight, six cylinder axial design
consisting of three double ended pistons and weighs
5.8 kg (12.7 lbs.)
Although this compressor is the same for all vehicle
applications, there are differences in installations,
mounting brackets, pulleys, torque cushions and
switches, none of which will affect the following overhaul
procedures.

This compressor has a clutch driver design without torque
cushion (1).

871RW001

Service compressors are supplied with either the control
switches assembled in the rear head or a plug may be
found where a control switch is required. If the service
compressor requires control switches, the plug may be
removed from the appropriate rear head switch cavity of
the replaced compressor and assembled as prescribed in
this manual.
When servicing the compressor, keep dirt or foreign
material from getting on or into the compressor parts and
system. Clean tools and a clean work area are important
for proper service. The compressor connections and the
outside of the compressor should be cleaned before any
“on vehicle” repairs, or before removal of the compressor.
The parts must be kept clean at all times and any parts to
be reassembled should be cleaned with solvent, and
dried with dry air. When necessary to use a cloth on any
part, it should be of a non-lint producing type