Page 88 of 288

88 UNDERSTANDING YOUR INSTRUMENT PANEL
Upper Air Vents . . . . . . . . . . . . . . . . . . . . . . . . . 120Heated Rear Window (Optional) . . . . . . . . . . . 121Windshield Heater (Optional) . . . . . . . . . . . . . 121Residual Engine Heat Utilization (REST) . . . . 122
Air Conditioning, Regulated (Optional) . . . . . . 122Climate Control (on Vehicles with Air
Conditioning) . . . . . . . . . . . . . . . . . . . . . . . . . . . 123Dehumidification
(on Vehicles with Air Conditioning) . . . . . . . . 124Air Conditioner for the Rear Passenger
Compartment (Optional) . . . . . . . . . . . . . . . . . 125Air Recirculation . . . . . . . . . . . . . . . . . . . . . . . . 126Air Strainer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Electric Blower (Optional) . . . . . . . . . . . . . . . . . . . 128
Heater Booster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Auxiliary Heater – Water or Air Heater
(Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130Auxiliary Heater Switch . . . . . . . . . . . . . . . . . . 132Timer Auxiliary Heater . . . . . . . . . . . . . . . . . . . 132Settings with the Auxiliary Heater
switched on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Auxiliary Heat Exchanger in Load
Compartment, only with Auxiliary Heater
(Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Auxiliary Heater – Tips for Coping with
Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138Overheating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Page 109 of 288
UNDERSTANDING YOUR INSTRUMENT PANEL 109
4
Legend for Switch Locations
1. Fog lamp switch (Optional), refer to "Fog Lamp Switch".
2. Headlamp range control, refer to "Headlamp Range Control".
3. Auxiliary heat exchanger switch (Optional) .
4. Heated rear window (Optional) .
5. Left-hand seat heater switch (Optional) .
6. Central locking switch with load compartment lock (Optional) .
7. Alarm pushbutton .
8. Deactivate Acceleration skid control (ASR) switch . 9. Switch for auxiliary heater (Optional)
10. Right-hand seat heater switch (Optional),
11. Sun roof operation switch (Optional)
.
12. Interior cargo area lighting (Optional), refer to "Interior Cargo Area Lighting".
13. Towing/passenger compartment protection switch (Optional) .
14. Airflow switch for the air conditioner for rear passenger compartment (Optional) .
15. Temperature control (Optional) .
16. Electric blower switch (Optional) .
17. Windshield heater switch (Optional).
18. Constant RPM switch (Optional).
Page 116 of 288
116 UNDERSTANDING YOUR INSTRUMENT PANELHEATING, VENTILATIONTemperature control (1)
Airflow control (2)
Air distribution control (3) Z
Air to the windshield and from the air vents
X Air to the windshield and footwell and from
the air vents
Y Air to the footwell and from the air vents
h Air from the air vents
NOTE: If the vehicle interior has been heated up by
intense sunlight, ventilate the interior briefly before
driving the vehicle.
Only with automatic heater control (Optional):
The selected temperature is reached as quickly as
possible in heater mode and then held constant.
WARNING!
Follow the recommended settings for heating and
cooling given on the following pages. Otherwise
the windows could fog up, impairing visibility
and endangering you and others.
Page 118 of 288
118 UNDERSTANDING YOUR INSTRUMENT PANELSelect air recirculation if dust or unpleasant odors
enter the vehicle.
NOTE: Prolonged air recirculation can worsen the air
quality and lead to fogging up of the windows. Shut off
air recirculation as soon as possible.
Only with automatic heat regulation and regulated air
conditioning (Optional):
Air recirculation is automatically switched off after
about 15 minutes or when engine is shut off.
Heating1. Set the airflow control (2) as required.
2. Set the temperature control (1) as required.
3. Set the air distribution control (3) between Y
and X .
4. Switch off air recirculation, refer to "Air
Recirculation".
5. Adjust the air vents as required, refer to "Side Air
Vents and Center Air Vents" .
Page 119 of 288
UNDERSTANDING YOUR INSTRUMENT PANEL 119
4
De-Fogging and De-Icing The Front Windows1. Set the airflow control (2) to position 3 or 4.
2. Set the temperature control (1) to P .
3. Set the air distribution control (3) to Z.
4. Switch off air recirculation, refer to "Air
Recirculation" . NOTE:
On vehicles with auxiliary heater (water
heater):
The additional heat exchanger in the load
compartment should be switched off to quickly de-fog
and de-ice the windshield and front side windows,
refer to "Auxiliary Heat Exchanger in Load
Compartment".
For how to switch on heater booster mode, refer to
"Heater Booster".
On vehicles with air conditioner (Optional):
At outside temperatures above 41 °F (+5 °C), switch on
the air conditioner for quicker dehumidification, refer
to "Air Conditioning, Regulated".
Page 121 of 288
UNDERSTANDING YOUR INSTRUMENT PANEL 121
4
Heated Rear Window (Optional)
The switch for the heated rear
window is located on the right-hand
side next to the steering column.
It can be used only when the engine
is running.
To switch it on:
Press upward; the indicator lamp in the switch will light up.
To switch off:
Press upward one more time.
NOTE: The heated rear window will automatically
switch off after about 15 minutes or when the engine is
turned off.
Windshield Heater (Optional)
The switch for the windshield heater
is located on the center section of the
dashboard.
It can be used only when the engine
is running.
To switch it on:
Press upward; the indicator lamp in the switch will light up.
To switch off:
Press upward one more time.
NOTE: The windshield heater will automatically
switch off after about 5 minutes or when the engine is
turned off.
Page 123 of 288

UNDERSTANDING YOUR INSTRUMENT PANEL 123
4
To switch on:
Press switch (1), the indicator lamp (2) in the switch
lights up.
To switch off:
Press switch (1) again, the indicator lamp (2) goes out.
NOTE : Run the air conditioning at least once a month
for about 10 minutes.
It is possible that the air conditioning will
automatically switch off at outside temperatures below
41 °F (+5 °C). Dehumidification is then also not
possible.
Condensation may emerge from the underside of the
vehicle.
The air conditioner only uses the refrigerant R-134a.
This refrigerant does not damage the earth’s ozone
layer.
Climate Control (on Vehicles with Air Conditioning)1. Set the airflow control (2) to position 1 to 4. Position 4 gives maximum cooling.
2. Set the temperature switch (1) as required (The interior temperature is regulated by the
Tempmatik. If the interior temperature falls below
the preset temperature, warm air is automatically
supplied).
3. Set the air distribution control (3) to h.
4. To switch on air conditioning, press switch (4).
WARNING!
While driving, deactivate the air conditioning
only temporarily to prevent window fogging.
Page 137 of 288

UNDERSTANDING YOUR INSTRUMENT PANEL 137
4
NOTE: Only on vehicles with automatic heater
control/regulated air conditioner:
Before switching on the heater or entering the switch-
on time, the temperature control (1) must be set to
maximum heater output (as illustrated).
Set the air distribution control (3) as required between
Y and Z .AUXILIARY HEAT EXCHANGER IN LOAD
COMPARTMENT, ONLY WITH AUXILIARY HEATER
(OPTIONAL)
The auxiliary heat exchanger switch
is located on the right next to the
steering column. To switch on at blower speed 1:
Press the upper section, the left-hand indicator lamp in
the switch lights up.
To switch on at blower speed 2:
Press the lower section, the right-hand indicator lamp
in the switch lights up.
To switch off :
Press the switch to the middle position.
Operation is only possible when the key is turned to
position 2 in the ignition lock.
NOTE:
The auxiliary heat exchanger in the load
compartment should be switched off at coolant
temperatures below 176 °F (+80 °C) to quickly de-fog
and de-ice the windshield and front side windows.