Activating/deactivating the residual heat function
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 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. The blower runs at medium speed.
It is possible that the residual heat function may be activated automatically
an hour after the SmartKey is removed. The vehicle is then ventilated for 30 minutes
to dry the air-conditioning system.
- 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 switch off: press the
button. The indicator lamp in the
button goes out.
Residual heat is deactivated automatically:
- after about 30 minutes
- when the ignition is switched on
- if the battery voltage drops
- if the coolant temperature is too low
See also:
Problems with the cooling with air
dehumidification function
If you can no longer switch on the cooling with
air dehumidification function via COMAND,
the cooling with air dehumidification function
is switched off due to a malfunction.
Consult a qualifi ...
Downhill gradients
On long and steep gradients, you must
reduce the load on the brakes by shifting
early to a lower gear. This allows you to take
advantage of the engine braking effect and
helps avoid overh ...
Activating the HOLD function
Make sure that the activation
conditions
are met.
Depress the brake pedal.
Quickly depress the brake pedal
further
until HOLD display 1 appears in the
multifunction display.
The HOLD ...
