Activating/deactivating the residual heat function
The "residual heat" function is only available in Canada.
It is possible to make use of the residual heat of the engine to continue heating the stationary vehicle for up to 30 minutes after the engine has been switched off. The heating time depends on the coolant temperature and on the interior temperature that has been set.
The blower will run at a low speed regardless of the airflow setting.
If you activate the residual heat function at high temperatures, only the ventilation will be activated.
► Turn the SmartKey to position 0 in the ignition lock or remove it.
► To activate: press the 
button.
The indicator lamp in the 
button
lights
up.
► To deactivate: press the 
button.
The indicator lamp in the 
button
goes
out.
Residual heat is deactivated
automatically:
• after approximately 30 minutes
• when the ignition is switched on
• if the battery voltage drops
• if the coolant temperature is too low
See also:
Off-road driving systems
4MATIC (permanent four-wheel drive)
If you fail to adapt your driving style, 4MATIC
can neither reduce the risk of accident nor
override the laws of physics. 4MATIC cannot
take account of road, we ...
Headlamps and indicator lamps
fogged up on the inside
The headlamps and the indicator lamps in the
exterior mirrors may fog up on the inside if
there is high atmospheric humidity.
► Drive with the headlamps switched on.
The level of moistur ...
Driving on wet roads
Do not drive through flooded areas.
Check the depth of any water before driving
through it. Drive slowly through standing
water. Otherwise, water may enter the
vehicle interior or the engine com ...