2006 Alfa Romeo 166 cooling

72
E - Fuel gauge and reserve
warning light
This shows the amount of fuel left in
the fuel tank.
0Tank empty;
1Tank full (see "Refuelling" paragraph
in this section).
This warning light comes on to indicate
that about 9 litres of fuel are left in the
tank.
IMPORTANTUnder certain condi-
tions (heavy slopes, for instance) the
reading on the gauge may differ from the
actual amount of fuel in the tank and
changes in level may be indicated late.
This is part of the operating logic of the
electronic control circuit to avoid highly
unstable readings due to swaying of the
fuel when travelling.F - Engine coolant temperature
gauge and maximum temperature
warning light (fig. 85)
This shows the temperature of the en-
gine coolant fluid and begins when the
fluid temperature exceeds about 50°C.
The pointer should normally be towards
the middle of the scale. If the pointer
reaches the higher temperature values
the request for vehicle performance
should be decreased.
The illumination of this warning light in-
dicates an excessive temperature of the
engine cooling fluid. In this case, stop the
car and contact Alfa Romeo Authorized
Services.IMPORTANT The temperature of the
engine coolant may rise towards the maxi-
mum values by obstruction or dirt on the
outer part of the engine cooling radiator.
In this case you are advised to inspect
and remove any obstructions and have
the outside of the radiator washed as
soon as possible.
fig. 85
A0D0121m

81
The passenger compartment climate
control (heating, cooling and ventilation)
can be used in the following ways:
– manual climate control, by selecting
the functions using the control panel but-
tons;
– automatic climate control, managed
by the system electronic control unit.ADJUSTING THE CENTRE
UPPER VENT
(fig. 89)
The upper vent is fitted with an open-
ing/closing control (A)
O= Completely open
●= completely closed.
368PGSm
fig. 89 The air is admitted to the passenger
compartment through a series of out-
lets/vents located on the dashboard, on
the front door panels, centre console and
floor as illustrated (fig. 88):
1Centre vents for demisting/defrosting
the windscreen
2Upper adjustable centre vent
3Central movable and adjustable out-
lets
4Movable and adjustable side outlets
5Vents for demisting/defrosting the
side windows
6Front seat floor vents
7Rear seat floor vents
8Rear seat adjustable and movable
outlets.

84
EQUIVALENT TEMPERATURE
The system makes it possible to control
the passenger compartment climate main-
taining the “equivalent temperature” lev-
el required by the driver. This “equivalent
temperature” is an estimator of the ideal
temperature (obtained through the devel-
opment of a complex mathematical algo-
rithm) needed to obtain the best temper-
ature and well-being in the passenger
compartment.
To bring about this operating condition,
select:
– the “equivalent temperature” re-
quired pressing the button (B-fig. 94);
– the AUTOposition pressing the but-
ton (D).
IMPORTANT The compressor can be
engaged automatically or manually. To
switch from one operating mode to the
other see the “Compressor on/off but-
ton” paragraph in this chapter.
DESCRIPTION OF CONTROLS
(fig. 94)
A- Climate control dedicated screen se-
lector button.
B- Rocker button for adjusting the “e-
quivalent temperature”.
C- Rocker button for fan speed adjust-
ment.
D- Automatic system operation selector
button.
E- Climate control compressor off/on
button.
F- Climate control system off/on but-
ton.
G- Rocker button for selecting air distri-
bution.
H- Air recirculation on/off button.
I- On/off button for maximum defrost-
ing/demisting windscreen and front side
windows, rearscreen heating, door mirror
resistances and resistances at windscreen
base (where applicable).
J- On/off button for rearscreen heating
and mirror defrosting and resistances in
windscreen wiper blade parking are at the
base of the windscreen (where applica-
ble).Adjustment button for
required equivalent
temperature
Pressing this rocker button up or down
respectively raises or lowers the equiva-
lent temperature required in the passen-
ger compartment.
Pressing the button upwards or down-
wards to the extreme HIGHorLOW
positions, the functions with the highest
heating or cooling power are engaged.

86
Air recirculation on/off
button
Pressing this button engages/disen-
gages recirculation of the air admitted to
the passenger compartment.
IMPORTANT Depending on how the
system is working (heating or cooling the
passenger compartment) the recirculation
function makes it possible to reach the re-
quired conditions faster. It is however in-
advisable to use this function on
rainy/cold days as it would considerably
increase the possibility of misting the win-
dows, especially if the conditioner is off.
It is advisable to use this function when
the vehicle is stationary in a queue or tun-
nel to prevent polluted air from entering
the passenger compartment. Prolonged
use of this function should however be
avoided, especially if there are several
persons aboard.Windscreen and front side
windows demisting/
defrosting button
Pressing this button the climate control
automatically activates the necessary
functions (quantity, distribution, tempera-
ture of the air admitted to the passenger
compartment) to quicken demisting/de-
frosting of the windscreen and front side
windows. Rearscreen heating, door mirror
heating and the resistances at the base of
the windscreen (in the wiper blade park-
ing area) are also automatically engaged
(for a determinate length of time) where
applicable.Rearscreen demisting/
defrosting on/off button
Pressing this button engages demist-
ing/defrosting of the rearscreen, door
mirrors and (optional for versions/mar-
kets where applicable) the resistances at
the base of the windscreen (in the wiper
blade parking area).
IMPORTANT Do not stick stickers on
the inside of the rearscreen over the heat-
ing filaments to prevent damage that
might adversely affect the system.

189
Circuits operated by relays are the fol-
lowing (fig. 89):
A.Dipped beam headlight
B.Climate control fan
C.Horn
D.Front fog light
F.. Petrol versions (single fan): engine
cooling radiator (high speed)
JTD versions (two-fan): engine cooling
radiator (high speed)
G.Conditioner compressor
H.Petrol versions: engine cooling radia-
tor (low speed)
JTD versions (two-fan): engine cooling
radiator (high speed)L.Fuel pump
M.Electronic injection main relay
N.Starter motor
P.Diesel filter warming (JTD versions)
JTD versions (two-fan): engine cooling
radiator (low speed)
To gain access to relays on the bracket
set behind the left headlight (fig. 91),
remove the cover (A-fig. 90) after
turning the fastening pins (B).Circuits operated by relays are the fol-
lowing (fig. 91):
– Brown base relay: additional heater
(JTD versions)
– Black base relay: engine cooling radi-
ator relay, high speed (JTD versions).
A0D0096m
fig. 90
A0D0110m
fig. 91

192
System/Component Fuse no. Ampere Location
Conditioner compressor 13 7.5A fig. 89
Cruise Control 5 10A fig. 86
Diesel fuel filter warming 23 30Afig. 89
(JTD versions) 5 40Afig. 89
Door mirror defrosting 2 7.5A fig. 93
Electrochromic driving mirror 15 10A fig. 93
Electronic injection control unit 20 10A fig. 89
21 15A fig. 89
22 20A fig. 89
Electronic injection system 16 5A fig. 86
Engine control unit 18 7.5A fig. 89
Engine cooling control unit 16 5A fig. 86
Engine cooling radiator fan 4 60A fig. 89
System/Component Fuse no. Ampere Location
Engine cooling radiator fan 5 40A fig. 89
EOBD system (socket) 18 5A fig. 86
Front LH power window
(ABI control unit) 18 20Afig. 93
Front RH power window
(ABI control unit) 3 20Afig. 93
Front LH seat electric adjustment 6 30A fig. 93
Front RH seat electric adjustment 5 30A fig. 93
Front LH seat warming 9 10A fig. 93
Front RH seat warming 8 10A fig. 93
Fuel pump 19 15A fig. 89
Fuel pump relay coil
(engine bay box) 16 5Afig. 86
Glow plug (JTD versions) 8 60A fig. 89
Headlight washer (intermittent) 12 20A fig. 86
Horns 11 15A fig. 89
I.C.S. system 5 10A fig. 86
6 7.5A fig. 86
7 20A fig. 86
18 5A fig. 86
Instrument panel 6 7.5A fig. 86
18 5A fig. 86

202 PROGRAMMED
MAINTENANCE
PRECAUTIONS
Many moving parts, high voltage cables
and parts that reach high temperatures
which may cause serious injury to unquali-
fied persons are located in the engine
compartment.
The following precautions should there-
fore be taken:
– Switch off the engine and wait until
it cools.
– Be particularly cautious when work-
ing near the engine cooling fan as this
may cut in unexpectedly on the basis of
the engine coolant temperature.
– Do not smoke or use naked flame.
– Always keep a fire extinguisher to
hand.
– Do not use the jack supplied with the
car for checking underneath it.Vehicle maintenance
should be entrusted to
an Alfa Romeo Author-
ized Service. For interventions of
routine maintenance and small
repairs you wish to carry out
your-self, make sure you always
have the proper equipment, gen-
uine Alfa Romeo spare parts and
the necessary liquids; do not,
however, carry out these opera-
tions if you have no experience.
The jack with which the
vehicle is fitted must on-
ly be used when changing a wheel.
All other operations where the ve-
hicle must be lifted require the use
of specific procedures and should
be carried out by Alfa Romeo Au-
thorized Services.
WARNING
Ensure that scarves, ties
and loose clothing cannot
get caught by moving parts.
WARNING
DANGER-SERIOUS INJU-
RY. When carrying out
checks or maintenance operations
in the engine compartment, take
special care not to bump the head
on the raised bonnet.
WARNING
Never smoke when
working in the engine
compartment: inflammable gas and
vapours may be present which con-
stitute a fire hazard.
WARNING

214
The antifreeze mixture
contained in the cooling
circuit guarantees pro-
tection down to –35°C.
CHECKING AND TOPPING-UP
ENGINE COOLANT
(fig. 7)
Periodically check that the level of fluid
in the expansion tank when cold and with
the car on level ground, is between
“MIN” and “MAX”.
If the level is too low, unscrew cap (A)
on the expansion tank and top-up. Top up only with the
same fluid contained in
the cooling circuit.
A0D0100m
fig. 7
The cooling system is
pressurised. If necessary
replace the cap only with another
original one, otherwise the effi-
ciency of the system could be com-
promised.
WARNING
To avoid being burnt,
when the engine is hot do
not remove the cap from the ex-
pansion tank.
WARNING