2002 ISUZU AXIOM air conditioning

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±51
Main Data And Specifications
General Specifications
Heater Unit
Temperature controlReheat air mix system
Capacity4.3 kw (3700 Kcal./hr.)
Air flow280 m
/h
HEATER CORE
TypePlate and corrugate fin
Element dimension167 mm (6.6 in.) y 151 mm (5.9 in.) y 35 mm (1.4 in.)
Radiating areaApprox. 2.4 m
EVAPORATOR ASSEMBLY
Capacity4.8 kw (4100 Kcal./hr.)
Air flow430 m
/hr
EVAPORATOR CORE
TypeAl-laminate louver fin type
Element dimension235 mm (9.3 in.) y 224 mm (8.8 in.) y 60 mm (2.4 in.)
EXPANSION VALVE
TypeInternal pressure equalizer type
CONDENSER
TypeParallel flow type
Radiation performance14.8 kw (12,700 Kcal./hr.)
CONDENSER FAN
Air flow850 m3/h
Fan size
261
RECEIVER/DRIER
TypeAssembly includes triple pressure switch
Internal volume300 cc (10 fl.oz.)
PRESSURE SWITCH
TypeTriple pressure switch
Low pressure control
ON: 206.0+30.0 kPa (29.8+4.3 psi)
OFF: 176.5+19.6 kPa (25.6+2.8 psi)
Medium pressure control
ON: 1471.0+98.1 kPa (213.3+14.2 psi)
OFF: 1078.7+117.7 kPa (156.4+17.7 psi)
High pressure control
ON: 2353.6+196.1 kPa (341.3+28.4 psi)
OFF: 2942.0+196.1 kPa (426.6+28.4 psi)
REFRIGERANT
TypeHFC-134a
Specified amount700 g (1.54 lbs.)

1A±52
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Torque Specifications
852R200009
874R200013

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±53
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
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
ºOn±Vehicleº repair, 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
Trichloroethane, naphtha, kerosene, or equivalent
solvent, and dried with dry air. Use only lint free cloths to
wipe parts.
The operations described below are based on bench
overhaul with compressor removed from the vehicle,
except as noted. They have been prepared in order of
accessibility of the components. When the compressor is
removed from the vehicle for servicing, the oil remaining
in the compressor should be discarded and new
compressor oil added to the compressor.
Compressor malfunction will appear in one of four ways:
noise, seizure, leakage or low discharge pressure.
Resonant compressor noises are not cause for alarm;
however, irregular noise or rattles may indicate broken
parts or excessive clearances due to wear. To check
seizure, de±energize the magnetic clutch and check tosee if the drive plate can be rotated. If rotation is
impossible, the compressor is seized. Low discharge
pressure may be due to a faulty internal seal of the
compressor, or a restriction in the compressor. Low
discharge pressure may also be due to an insufficient
refrigerant charge or a restriction elsewhere in the
system. These possibilities should be checked prior to
servicing the compressor. If the compressor is
inoperative, but is not seized, check to see if current is
being supplied to the magnetic clutch coil terminals.
The compressor oil used in the HFC±134a system
compressor differs from that used in R±12 systems.
Also, compressor oil to be used varies according to the
compressor model. Be sure to avoid mixing two or more
different types of oil.
If the wrong oil is used, lubrication will be poor and the
compressor will seize or malfunction.
DKV-14G Type Compressor
DKV±14G is equipped with five±vane rotary compressor.
These vanes are built into a rotor which is mounted on a
shaft.
When the shaft rotates, the vanes built into the cylinder
block assembly are operated by centrifugal force.
This changes the volume of the spare formed by the rotor
and cylinder, resulting in the intake and compression of
the refrigerant gas. The discharge valve and the valve
stopper, which protects the discharge valve, are built into
the cylinder block assembly. There is no suction valve but
a shaft seal is installed between the shaft and head; a
trigger valve, which applies back pressure to the vanes, is
installed in the cylinder block and a refrigerant gas
temperature sensor is installed in the front head.
The specified quantity of compressor oil is contained in
the compressor to lubricate the various parts using the
refrigerant gas discharge pressure.
871RX002

1A±54
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Diagnosis
ConditionPossible causeCorrection
Noise from compressionDefective rotor/pistonReplace compressor/cylinder and
shaft assembly
Defective shaftReplace compressor/cylinder and
shaft assembly
Noise from magnetic clutchDefective bearingReplace magnetic clutch
Defective clutchReplace magnetic clutch
Clearance between drive plate and
pulley not standardAdjust the clearance or replace
magnetic clutch
Insufficient coolingDefective gasketReplace compressor/gasket
Defective rotor/reed valveReplace compressor/valve plate
Defective trigger valve/suction valveReplace compressor/suction valve
Not rotatingDefective rotor/pistonReplace compressor/cylinder and
shaft assembly
Defective shaftReplace compressor/cylinder and
shaft assembly
Rotating parts seized due to
insufficient oilReplace compressor
Oil and/or gas leakageDefective sealReplace compressor/shaft seal
Defective O-ringReplace

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±55
Magnetic Clutch Assembly (DKV-14G Type)
Parts Location View
871RX025
Legend
(1) Drive Plate bolt
(2) Drive Plate
(3) Snap Ring(4) Pulley Assembly
(5) Field Coil
(6) Shim (s)
(7) Lead Wire
Removal
1. Using drive plate holder J-33939 (1) to prevent the
drive plate from rotating, then remove the drive plate
bolt.
871RX029
2. Remove drive plate by using drive plate puller
J-33944-A (2) and forcing screw J-33944-4 (1).
871RX023
3. Remove shim (s).

1A±56
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
4. Remove snap ring (1) by using snap ring pliers.
871RY00029
5. Remove pulley assembly by using pulley puller pilot
J-38424 (2), pulley puller J-8433 (1) and pulley puller
leg J-24092-2 (3).
871RY00033
6. Loosen screw and disconnect the field coil wire
connector.
871RY00030
7. Loosen three screws and remove the field coil.
871RY00034

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±57
Inspection and Repair
Drive Plate
If the frictional surface shows signs of damage due to
excessive heat, the drive plate and pulley should be
replaced.
Pulley Assembly
Check the appearance of the pulley assembly. If the
frictional surface of the pulley shows signs of excessive
grooving due to slippage, both the pulley and drive plate
should be replaced. The frictional surfaces of the pulley
assembly should be cleaned with a suitable solvent
before reinstallation.
Coil
Check coil for loose connector or cracked insulation.
Installation
1. Install field coil.

Align the located portion (1) of the field coil and
compressor.
871RY00035

Tighten the mounting screw to the specified torque.
Torque: 5N´m (44 lb in)
2. Connect the lead wire connector with the rubber hold
and tighten the screw.3. Install pulley assembly by using pulley installer
J-33940-A (2) and drive handle J-8092 (1).
871RY00032
4. Install snap ring.
5. Install shim (s).
6. Install the drive plate to the compressor drive shaft
together with the original shim(s)(1). Press the drive
plate by hand.
871RY00031

1A±58
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
7. Install drive plate bolt by using drive plate holder
J-33939 (1) to prevent the drive plate from rotating.
871RX029

Tighten the drive plate bolt to the specified torque.
Torque: 13 N´m (113 lb in)

After tightening the drive plate bolt, check to be sure
the pulley rotates smoothly.
Check to be sure that the clutch clearance is
between 0.3-0.6 mm (0.01-0.02 in.)871RY00028
Legend
(1) Dial Gauge
(2) Pulley Assembly
(3) Field Coil Wire Connector

If necessary, install adjusting shim(s).

Adjusting shims are available in the following
thickness.
Thickness

0.1 mm (0.0039 in.)

0.3 mm (0.0118 in.)

0.5 mm (0.0197 in.)