Iveco Stralis AT/AD. Manual

LEAK FINDER FOR AIR-CONDITIONING
SYSTEMS WITH HFC R134A (9905147)

Tool L-780A makes it possible to identify leakage of HFC 134A
gas from the system extremely accurately in the order of 3.3
g a year with the switch on maximum sensitivity.

This instrument requires no settings, the operator only needs
to select the desired sensitivity.

The instrument warns the operator of any gas leakage with a
buzzer and a LED that flashes in proportion to the
concentration of gas.

In addition, the LED indicates the battery is flat if it goes out.

Operating temperature is between 0 C and 50

°C.

The instrument is equipped with a flexible probe to reach
particularly difficult fittings or parts.

The two levels of sensitivity are:

- low sensitivity = 16.5 g/year;
- high sensitivity = 3.3 g/year.

OPERATIONS PRIOR TO DISCONNECTING
THE STATION FROM THE SYSTEM

Always observing the above safety rules, carry out the following
operations:

- check that all the valves are closed: LOW - HIGH, V1 - V2;

- disconnect the pipes of valves V1 - V2 and put the caps back

onto the system valves;

- Check the system again with the leak finder.

CHECKING THE PRESSURES IN THE SYSTEM

After filling, leave the pipes connected and carry out the
following check:

- close the HIGH and LOW valves, V1 and V2 open;

- turn on the engine, switch on the air-conditioner and check

on the pressure gauges M1 and M2 that the pressures
correspond, normally: low pressure no less than 1 bar, high
pressure 15

÷ 18 bar, depending on the system

specifications.

Figure 27

Figure 28

50642

50643

Normally, with the air-conditioner switched on, air
should come out of the vents at a temperature lower
than 5

°C and after a period of operation to stabilize

the temperature of the ducts.

Before checking vehicles, wait for the engine to cool,
the hot parts can falsify the test.

BODYWORK AND CHASSIS FRAME

TRALIS

AT/AD

Base - January 2003

- Unscrew the screws (2) fixing the heater (5) to the cross

member on the cab.

- Detach the clamps (1) of the wiring bundles.

- Disconnect the connectors (4) and detach the relative

electric wiring (3).

- Detach the heater (5) from the vehicle.

77122

77124

Figure 29

- Working from inside the cab, unscrew the screws (1)

fixing the air ducts (2) to the heater (3).

- Disconnect the air ducts (2) from the heater (3).

553210

HEATER

Removal

To remove the heater assembly, it is necessary to:

drain off the engine coolant:

detach the fascia covering (552211).

- Lift the radiator cowling.

- Unscrew the fixing screws (1) and separate the pollen

filter cover (2) to access the underlying fasteners.

Figure 30

77123

- Disconnect the retaining clamps (1) and the water pipes

(2).

- Unscrew the screws (4) fixing the low and high pressure

piping (5) to the body, and screws (3) near the water
pipes.

- Apply special plugs on the high and low pressure pipes

and on the expansion valve.

Figure 31

Figure 32

77125

Refitting

Refit by carrying out the steps described for removal in reverse
order. At the end, check that:

- the engine coolant is at the right level;

- the system and components involved in the described

procedure work properly.

BODYWORK AND CHASSIS FRAME

TRALIS

AT/AD

REPAIR OPERATIONS

- Disconnect the electrical connection (1).

- Detach the clamp (3) and free the pipe (2) from the

heater (4).

- Detach the additional heater (4) from the vehicle.

77126

Figure 33

Removal

- Lift the radiator cowling.

- Tilt up the cab.

- Unscrew the screws (7) of the clamps (6) and disconnect

the fuel pipe (5).

- Unscrew the screws (1).

- Disconnect the clamps (2) and detach the inlet and outlet

pipes (3).

- Unscrew the nuts (4) fixing the additional heater to the

floor of the cab.

77128

Figure 34

77127

- Lower the cab.

- Close the radiator cowling.

- Working from inside the cab, detach the cushion (1) and

lift the door (2) of the additional heater compartment.

Figure 35

Refitting

Refit by carrying out the procedures described for
removal in reverse order.

553254

DEFROST CONTROL MOTOR

77129

Figure 36

Removal

- Undo the fasteners and detach the air diffuser openings

(1).

- Working through the seat of the air diffuser openings,

unscrew the screws (2) fixing the air pipe (3).

- Remove the bottom covering of the instrument panel as

described in operation (552211).

BODYWORK AND CHASSIS FRAME

TRALIS

AT/AD

Base - January 2003

ADDITIONAL AIR HEATER SYSTEM

- Take off the press-on plugs fixing the air pipe to the cross

member under the fascia.

- Unscrew the fixing screw and take out the air pipe.

- Disconnect the power supply connector (2).

- Unscrew the fixing screws (1).

- Detach the DEFROST control motor (3) from the

vehicle.

77113

- Unscrew the screws (2) fixing the Body Control (1).

- Remove the Body control (1) and set it aside.

Figure 37

77104

- Undo the fasteners and take off the moulding (2) to get

to the underlying screws.

- Unscrew the fixing screws (1) and remove the

connection (3) of the moulding (2).

Refitting

Refit by carrying out the procedures described for
removal in reverse order.

Figure 38

77105

- Open the glove compartment (3).

- Detach the tie rods (1).

- Unscrew the nuts (2) and detach the glove compartment.

Figure 39

Figure 40

77130

BODYWORK AND CHASSIS FRAME

TRALIS

AT/AD

Content .. 271 272 273 274 ..

Iveco Stralis AT/AD. Manual - part 273