Open climate view in the centre display by pressing the symbol in the middle of the climate row.
Select the Parking climate tab.
Press Keep climate comfort.
Climate comfort retention is started/switched off and the button illuminates/extinguishes.
It is not possible to start climate comfort retention if there is not enough residual heat in the engine to maintain the passenger compartment climate, or if the outside temperature is above approx. 20°C (68°F).
Climate comfort retention is switched off when the car is locked from the outside to avoid using residual heat unnecessarily. Use of the function is intended to maintain climate comfort when driver or passengers remain inside the car.
There is a limit to how long climate comfort can be maintained in a cold climate, which depends on the amount of residual heat available.