2007 ISUZU KB P190 heater

HEATER AND AIR CONDITIONING 1-25

(4JJ1-TC Standard Output, 4JJ1-TC High Output, 4JK1-TC High Output RHD MODEL) N⋅
⋅⋅
⋅
m (kgf ⋅
⋅⋅
⋅
m/lb ⋅
⋅⋅
⋅
in)





RTW 710LF003401



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ISUZU KB P190 2007

1-26 HEATER AND AIR CONDITIONING

(C24SE RHD MODEL) N⋅
⋅⋅
⋅
m (kgf ⋅
⋅⋅
⋅
m/lb ⋅
⋅⋅
⋅
in)








RTW 710LF003501


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ISUZU KB P190 2007

HEATER AND AIR CONDITIONING 1-27

(4JA1-T, 4JH1-TC LHD MODEL) N⋅
⋅⋅
⋅
m (kgf ⋅
⋅⋅
⋅
m/lb ⋅
⋅⋅
⋅
in)





RTW 710LF003601


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ISUZU KB P190 2007

1-28 HEATER AND AIR CONDITIONING

(4JJ1-TC Standard Output, 4JJ1-TC High Output, 4JK1-TC High Output LHD MODEL) N⋅
⋅⋅
⋅
m (kgf ⋅
⋅⋅
⋅
m/lb ⋅
⋅⋅
⋅
in)




RTW 710LF003701


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ISUZU KB P190 2007

HEATER AND AIR CONDITIONING 1-29

(C24SE LHD MODEL) N⋅
⋅⋅
⋅
m (kgf ⋅
⋅⋅
⋅
m/lb ⋅
⋅⋅
⋅
in)





RTW 710LF003801


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ISUZU KB P190 2007

1-30 HEATER AND AIR CONDITIONING
ON-VEHICLE SERVICE
PRECAUTIONS FOR REPLACEMENT OR
REPAIR OF AIR CONDITIONING PARTS
There are certain procedures, practices and precautions that
should be followed when servicing air conditioning systems:
• Keep your work area clean.
• Always wear safety goggle and protective gloves when
working on refrigerant systems.
• Beware of the danger of carbon monoxide fumes caused by
running the engine.
• Beware of discharged refrigerant in enclosed or improperly
ventilated garages.
•
Always disconnect the negative battery cable and discharge
and recover the refrigerant whenever repairing the air
conditioning system.
• W hen discharging and recovering the refrigerant, do not
allow refrigerant to discharge too fast; it will draw
compressor oil out of the system.
• Keep moisture and contaminants out of the system. W hen
disconnecting or removing any lines or parts, use plugs or
caps to close the fittings immediately.
Never remove the caps or plugs until the lines or parts are reconnected or installed.
• W hen disconnecting or reconnecting the lines, use two
wrenches to support the line fitting, to prevent from twisting
or other damage.
• Always install new O-rings whenever a connection is
disassembled.
• Before connecting any hoses or lines, apply new specified
compressor oil to the O-rings.
• W hen removing and replacing any parts which require
discharging the refrigerant circuit, the operations described
in this section must be performed in the following sequence:

1) Using the ACR
4 (HFC-134a Refrigerant Recovery/
Recycling/Recharging/System) or equivalent to
thoroughly discharge and recover the refrigerant.
ACR
4 (115V 60Hz) : 5-8840-0629-0 (J-39500-A)
ACR4 (220-240V 50/60Hz)
: 5-8840-0630-0 (J-39500-220A)
ACR
4 (220-240V 50/60Hz Australian model)
: 5-8840-0631-0 (J-39500-220ANZ)
2) Remove and replace the defective part.
3)
After evacuation, charge the air conditioning system and
check for leaks.


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ISUZU KB P190 2007

HEATER AND AIR CONDITIONING 1-31

REPAIR OF REFRIGERANT LEAKS
Refrigerant Line Connections



RTW 410SH000101
Install new O-ring, if required. W hen disconnecting or
connecting lines, use two wrenches to prevent the connecting
portion from twisting or becoming damaged.


W hen connecting the refrigerant line at the block joint, securely
insert the projecting portion of the joint portion into the
connecting hole on the unit side and secure with a bolt.




Apply specified compressor oil to the O-rings prior to
connecting.

CAUTION:
Compressor (PAG) oil to be used varies according to
compressor model. Be sure to apply oil specified for the
model of compressor.



O-rings must be closely aligned with raised portion of
refrigerant line.


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ISUZU KB P190 2007

1-32 HEATER AND AIR CONDITIONING

Insert nut into union. First tighten nut by hand as much as
possible. Then, tighten nut to specified torque.
(Refer to "Special Parts Fixing Nuts and Bolts" in this section)


LEAK AT REFRIGERANT LINE
CONNECTIONS

1) Check the torque on the refrigerant line fitting and, if too
loose, tighten to the specified torque.
• Use two wrenches to prevent twisting and damage to the
Line.
• Do not over tighten.
2) Perform a leak test on the refrigerant line fitting.
3) If the leak is still present, discharge and recover the refrigerant from the system.
4) Replace the O-rings. • O-rings cannot be reused. Always replace with new
ones.


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


5) Retighten the refrigerant line fitting to the specified torque.
• Use two wrenches to prevent twisting and damage to the
line.
6) Evacuate, charge and retest the system.

LEAK IN THE HOSE
If the compressor inlet or outlet hose is leaking, the entire hose
must be replaced. Refrigerant hose must not be cut or spliced
for repair.
1) Locate the leak.
2) Discharge and recover the refrigerant.
3) Remove the hose assembly. • Cap the open connections at once.
4) Connect the new hose assembly. • Use two wrenches to prevent twisting or damage to the
hose fitting.


• Tighten the hose fitting to the specified torque.
5) Evacuate, charge and test the system.

COMPRESSOR LEAKS
If leaks are located around the compressor shaft seal or shell,
replace or repair the compressor.

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ISUZU KB P190 2007