2004 ISUZU TF SERIES Workshop Manual

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Page 3041 of 4264

ISUZU TF SERIES 2004 Workshop Manual HEATER AND AIR CONDITIONING 1-31
CHARGING THE REFRIGERANT SYSTEM
There are various methods of charging refrigerant into the air
conditioning system.
These include using the ACR
4 (HFC-134a Refrig

Page 3042 of 4264

ISUZU TF SERIES 2004 Workshop Manual 1-32 HEATER AND AIR CONDITIONING
F06R300013

Direct charging with a manifold gauge charging
station method.
Handling the charging valve handle when installing refrigerant
contain

Page 3043 of 4264

ISUZU TF SERIES 2004 Workshop Manual HEATER AND AIR CONDITIONING 1-33
refrigerant container.

1) Make sure the evacuation process is correctly completed.
2) Connect the center-hose of the manifold gauge to the
refrigerant cont

HEATER AND AIR CONDITIONING 1-33
refrigerant container.

1) Make sure the evacuation process is correctly completed.
2) Connect the center-hose of the manifold gauge to the
refrigerant container.

Turn the charge valve handle counterclockwise to purge
to the charging line and purge any air exiting in the
center-hose of the manifold gauge.
3) Open the low-pressure hand valve and charge the
refrigerant about 200 g (0.44 lbs.).

Make sure the high-pressure hand valve is closed.

Avoid charging the refrigerant by turning the refrigerant
container upside down.
4) Close the low-pressure hand valve of the manifold gauge.

Check to ensure that the degree of pressure does not
change.
5) Check the refrigerant leaks by using a HFC-134a leak
detector.

If a leak occurs, repair the leak connection, and start all
over again from the first step of evacuation.
6) If no leaks are found, open the low-pressure hand valve of
the manifold gauge. Then continue charging refrigerant to
the system.

When charging the system becomes difficult:
(1) Run the engine at Idling and close the all vehicle
doors.
(2) A/C switch is "ON".
(3) Set the fan control knob (fan switch) to its highest
position.
(4) Set air soure selector lever to “RECIRC”

WARNING
BE ABSOLUTELY SURE NOT TO OPEN THE HIGH-
PRESSURE HAND VALVE. SHOULD THE HIGH-
PRESSURE HAND VALVE BE OPENED, THE HIGH-
PRESSURE REFRIGERANT GAS WOULD FLOW
BACKWARD, AND THIS MAY CAUSE THE REFRIGERANT
CONTAINER TO BURST.
7) When the refrigerant container is emptied, use the following
procedure to replace it with a new refrigerant container.
(1) Close the low-pressure hand valve.
(2) Raise the needle upward and remove the charge valve.
(3) Reinstall the charge valve to the new refrigerant
container.
(4) Purge any air existing in the center hose of the manifold
gauge.
8) Charge the system to the specified amount and then close
the low-pressure hand valve.
Refrigerant Amount g(lbs.)
720 (1.59)

Page 3044 of 4264

ISUZU TF SERIES 2004 Workshop Manual 1-34 HEATER AND AIR CONDITIONING

9) Check for refrigerant leaks by using a HFC-134a leak
detector.

A fully charged system is indicated by the sight glass on
the receiver/drier being free

Page 3045 of 4264

ISUZU TF SERIES 2004 Workshop Manual HEATER AND AIR CONDITIONING 1-35
Reading Sight Glass

High and low
pressure pipe
temperature The high pressure
pipe is hot and the
low pressure pipe
is cold. There is a
distinct difference

HEATER AND AIR CONDITIONING 1-35
Reading Sight Glass

High and low
pressure pipe
temperature The high pressure
pipe is hot and the
low pressure pipe
is cold. There is a
distinct difference
in temperature
between them. The high pressure
pipe is warm and
the low pressure
pipe is cool. There
is no great
difference in
temperature
between them. There is little
difference in
temperature
between the high
pressure pipe and
the low pressure
pipe. The high pressure
pipe is hot and the
low pressure pipe
is slightly warm.
There is a
difference in
temperature
between them.
Sight glass
condition Almost transparent.
A flow of bubbles
can be seen, but
they disappear
when the throttle is
opened.

A flow of bubbles
always can be
seen. It appears
sometimes
transparent, and
sometimes frothy.
Something like fog
faintly can be seen.
Evan at idle with
the fan at "HI" (with
the window fully
open), the bubbles
cannot be seen.

Air conditioning
cycle condition
OK NG
(Not enough
refrigerant) NG
(Almost no
refrigerant) NG
(Too much
refrigerant)

The sight glass provides accurate diagnosis only under the following conditions.
If the vehicle can be tested under these conditions, check the sight glass appearance and compare to the chart.
* Engine speed Idling
* A/C switch "ON"
* Blower fan operating at highest speed
* Air source selector lever at "RECIRC"
* Temperature control knob at coldest position
* Ambient temperature below 35
C (95
F) and humidity below 70% (See NOTE 1)
* High side pressure less than 1470 kPa (15 kg/cm
2 / 213 PSI) (See NOTE 2)

NOTE 1
If the vehicle cannot be moved to a testing location that meets these specifications, then the sight glass cannot be
used for diagnosis. You must discharge and recover the refrigerant, then recharge the system with the specified
amount of refrigerant. Then continue checking the system performance.

NOTE 2
If the high side pressure is greater than stated, the sight glass cannot be used for diagnosis. You must discharge
and recover the refrigerant, then recharge the system with the specified amount of refrigerant. Then continue
checking system performance.

Page 3046 of 4264

ISUZU TF SERIES 2004 Workshop Manual 1-36 HEATER AND AIR CONDITIONING
CONDENSER
REMOVAL AND INSTALLATION (4JA1-TC, 4JH1-TC)

This illustration is based on RHD model RTW410LF000501
Removal Steps
1. Radiator grille
2. Fr

Page 3047 of 4264

ISUZU TF SERIES 2004 Workshop Manual HEATER AND AIR CONDITIONING 1-37

REMOVAL AND INSTALLATION (EXCEPT 4JA1-TC, 4JH1-TC)

RTW410LF000701

Removal Steps
1. Radiator grille
2. Engine hood lock
3. Engine hood fron

Page 3048 of 4264

ISUZU TF SERIES 2004 Workshop Manual 1-38 HEATER AND AIR CONDITIONING
CONDENSER FAN MOTOR
REMOVAL AND INSTALLATION

RTW410MF000101

Removal Steps
1. Radiator grille
2. Fan connector
3. Condenser fan motor

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