
Heating and air conditioning system115
Using the systemSafetyDriving TipsGeneral MaintenanceBreakdown assistanceTechnical Data
For the sake of the environment
When you economize on fuel, you also reduce pollutant emissions.
Operational problems
If the cooling system does not operate at outside temperatures higher than +5 °C,
there is a problem in the system. The reasons for this may be:
•The fuse on the air conditioning system has blown. Check the fuse, replace it if
necessary ⇒page 257.
•The cooling system has switched off automatically for a short time because the
coolant temperature of the engine is too hot ⇒page 18.
If you are not able to rectify the operat ional problem yourself, or if the cooling
capacity decreases, switch the cooling sy stem off. Contact a specialist garage.
Climatronic* (automatic air conditioning)
Description
The Climatronic system is a combination of an automatic heating,
fresh air and cooling system which provides optimal comfort for the
occupants of the car.
The Climatronic maintains fully automatically a convenience temperature. This is
achieved by automatically varying the temperature of the outflowing air, the blower
stages and the air distribution. The system also takes into account sunlight which
eliminates the need to alte r the settings manually. The automatic mode
¨ ⇒ page 117 ensures maximum wellbeing of th e occupants at all times of the year.
Description of Climatronic system
The cooling operates only if the following conditions are met:
•engine running,
•outside temperature above approx. +2°C,
• switched on.
If the cooling system is switched on, th e temperature and air humidity drops in the
vehicle. The wellbeing of the occupants of the car is enhanced as a result of this
particularly at high outside temperatur es and a high air humidity. The system
prevents the windows misting up during the cold season of the year.
The heating effect is dependent upon th e coolant temperature, thus full heat
output only occurs when the engine has reached its operating temperature.
It is possible to briefly activate recirc ulated air mode in order to enhance the
cooling effect ⇒page 118.
The air inlet in front of the windscreen must be free of ice, snow or leaves in order
to ensure that the heating and cooling systems operate properly.
The AC compressor is switched off at a hi gh coolant temperature in order to provide
cooling at a high load of the engine.
After switching on the cooling Condensation from the evaporator of the air condi-
tioning may drip down and form a puddle below the vehicle. This is quite normal
and not an indication of a leak!
Recommended setting for all periods of the year:
•Set the desired temperature, we recommend 22 °C.
•Press the button ⇒page 116, fig. 140 .
•Move the air outlet vents 3 and 4 so that the air flow is directed slightly upwards.
Aeration of the vehicle when ignition is switched off*
On models fitted with power sliding/tilting roof with sollar cells, the fresh air blower
is automatically switched over to “solar mode” if the sun ray's are sufficient after
switching off the ignition. The solar cells on the sliding/tilting roof deliver power for
the fresh air blower. This supplies the interior of the car with fresh air.
For an optimum ventilation, the air outlet vents 3 and 4 must be opened
⇒ page 108, fig. 136.
The ventilation functions only when the sliding/tilting roof is closed.
AC
AUTO
20A5Facelift.book Page 115 Saturday, September 6, 2008 2:13 PM

Heating and air conditioning system117
Using the systemSafetyDriving TipsGeneral MaintenanceBreakdown assistanceTechnical Data
Button for direct switching on/off of au
xiliary heating (auxiliary heating)*
⇒ page 119
Switching on/off of the temperature setting in dual mode
Switching cooling on and off
Setting of the temperature for the right side, operation of the seat heating of
the right front seat*
Note
Below the top row of buttons is located the interior temperature sensor. Do not
glue or cover over the sensor, otherwise it could have an unfavourable effect on the
Climatronic.
Automatic mode
The automatic mode is used in order to maintain a constant temper-
ature and to demist the windows in the interior of the car.
Switching automatic mode on
– Set a temperature between +18 °C and +26 °C.
– Move the air outlet vents 3 and 4 ⇒ page 108, fig. 136 so that the air
flow is directed slightly upwards.
– Press the button . In the right or left top corner a warning light lights up, depending on which unit was last selected.
If the warning light in the top right corner of the button lights up, the
Climatronic operates in “HIGH” mode. The “HIGH” mode is the standard setting of
the Climatronic.
When pressing again the button , the Climatronic changes into the “LOW”
mode and the warning light in the top left corner lights up. The Climatronic uses
only in this mode the lower blower speed. However taking into account the noise
level, this is more comfortable, yet be aw are that the effectiveness of the air condi-
tioning system is reduced particularly if the vehicle is fully occupied.
By pressing again the button , yo u change into the “HIGH” mode. The automatic mode is switched off by pr
essing the button for the air distribution
or increasing or decreasing the blower speed. The temperature is nevertheless
regulated.
switching cooling on and off
switching cooling on and off
– Press the button ⇒ page 116, fig. 140. The warning light lights up
in the button.
– When you again press the switch , the cooling system is switched off. The warning light in the button goes out. Only the function of the
ventilation remains active when no lower temperature than the
outside temperature can be reached.
Setting temperature
You can separate the interior temperature for the left and right side sepa-
rately.
– You can set the temperature for both sides after switching on the igni- tion with the control dial .
– If you wish to set the temperature for the right side, turn the control dial . The warning light in the bu tton lights up, this indicates
that differing temperatures for the left and right side can be set.
If the warning light in the button lights up, the temperature for both sides
cannot be set with the control dial . You can reinitiate this function by pressing
the button . The warning light in the button which indicates the possibility to
set differing temperatures for the left and right side, goes out.
You can set the interior temperature be tween +18°C and +26°C. The interior
temperature is regulated automatically within this range. If you chose a tempera-
ture lower than +18°C, a blue symbol lights up at the start of the numerical scale. If
you chose a temperature higher than +26°C, a red symbol lights up at the end of
A11
A12DUAL
A13AC
A14
AUTO
AUTO
AUTO
AUTO
AC
AC
A7
A14DUAL
DUALA7DUAL
20A5Facelift.book Page 117 Saturday, September 6, 2008 2:13 PM

Heating and air conditioning system119
Using the systemSafetyDriving TipsGeneral MaintenanceBreakdown assistanceTechnical Data
dent increases. Switch recirculated
air mode off as soon as the windows
begin misting up.
Note
•If the windscreen mists up, press the button ⇒page 116, fig. 140.
After the windscreen has been demisted, press the button .
•The automatic air distribution control operates only if the outside temperature
is higher than approx. 2°C.
Controlling blower
There are a total of seven blower stages available.
The Climatronic system controls the bl ower stages automatically in line
with the interior temperature. You can also, however, adapt the blower
stages manually to suit your particular needs.
– P re s s a g a i n t h e b u t t o n o n t h e l e f t s i d e ( re d u c e b l o w e r s p e e d ) o r o n the right side (increase blower speed).
If you switch off the blower, the Climatronic is switched off.
The set blower speed is displayed above the button when the respective
number of warning lights come on.
WARNING
•“Stale air” may result in fatigue in the driver and occupants, reduce
attention levels and also cause the windows to mist up. The risk of having an
accident increases.
•Do not switch the Climatronic system off for longer than necessary.
•Switch the Climatronic system on as soon as the windows mist up.
Defrosting windscreen
Defrosting windscreen - switching on
–Press the button ⇒page 116, fig. 140 .
Defrosting windscreen - switching off
– Once again press the button or the button .
The temperature control is controlled auto matically. More air flows out of the air
outlet vents 1.
Auxiliary heating (auxiliary heating and ventilation)*
Description and important information
The auxiliary heating (auxiliary heating and ventilation) heats or
supplies the interior of the vehicl e with fresh air independent of the
engine.
Auxiliary heating (auxiliary heating)
The auxiliary heating (auxiliary heating) func tions in connection with the Climatic or
Climatronic.
It can be used when stationary, when engi ne is switched off for preheating of the
vehicle as well as while driving (only during the heating phase of the engine).
The auxiliary heating (auxiliary heating) warms up the coolant during the combus-
tion of fuel from the vehicle tank. The coolant warms up the air, which (if the blower
speed is not set to zero) flows into the occupant compartment.
11)
Auxiliary ventilation
The auxiliary ventilation enables fresh air to flow into the vehicle interior by
switching off the engine, whereby the interior temperature is effectively decreased
(e.g. with the vehicle parked in the sun).
WARNING (continued)
A1AUTO
11)However the coolant does not warm up the engine.
AUTO
20A5Facelift.book Page 119 Saturday, September 6, 2008 2:13 PM

Index295
Using the systemSafetyDriving TipsGeneral MaintenanceBreakdown assistanceTechnical Data
Index
A
Abroad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
ABS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
Adjusting seats . . . . . . . . . . . . . . . . . . . . . . . . . . . 76, 164 electrically . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Adjusting the steering wheel . . . . . . . . . . . . . . . . . . 124
Air conditioning system . . . . . . . . . . . . . . . . . . . . . . 111 Air outlet vents . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Recirculated air mode . . . . . . . . . . . . . . . . . . . . 114
Airbag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174 Deployment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Front airbag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Head airbag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Side airbag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Airbag system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174 Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Airbags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Alternator Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Antilock brake system . . . . . . . . . . . . . . . . . . . . . . . . 197
Antilock brake system (ABS) Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Anti-theft alarm system . . . . . . . . . . . . . . . . . . . . . . . 51 Ashtray . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Auto Check Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Auto Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Automatic gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Emergency programme . . . . . . . . . . . . . . . . . . 139
Kickdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Selector lever-emergency unlocking . . . . . . . 140
Tiptronic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Automatic light control . . . . . . . . . . . . . . . . . . . . . . . . 60
Automatic seat adjustment . . . . . . . . . . . . . . . . . . . . 78
Automatic vehicle wash systems . . . . . . . . . . . . . . 212
Automatic wiper/washer system . . . . . . . . . . . . . . . 69
Avoiding damage to your vehicle . . . . . . . . . . . . . 207
B
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41, 232 change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234
Inspecting the electrolyte level . . . . . . . . . . . . 234
Operation in winter . . . . . . . . . . . . . . . . . . . . . . 234
Before setting off . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Belt Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Belt tensioners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Bluetooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144, 153 Bonnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15, 224
Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Boot lid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Brake Handbrake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Brake Assist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Brake booster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Brake fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
Brake pads Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Buttons for the central locking system . . . . . . . . . . 47
Buttons on the driver's door Power windows . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
C
Car jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246, 251
Car state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Catalytic converter . . . . . . . . . . . . . . . . . . . . . . . . . . 202
CD changer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Central locking system . . . . . . . . . . . . . . . . . . . . . . . . 45lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
unlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Changing a wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
Changing bulbs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262
20A5Facelift.book Page 295 Saturday, September 6, 2008 2:13 PM