HeaterHeater  - For pleasant driving - Mitsubishi Lancer Owner's Manual - Mitsubishi Lancer

The heater can only be used while the engine is running.

See also:

Possible driving speed (Except for vehicles with Sports mode)
In order to avoid damaging the engine due to excessively high rpm, do not exceed the possible driving speed when the selector lever is set to the “3” (THIRD) position, the “2” (SECOND) pos ...

Instruments and controls
Note ► The fuel units, temperature units, display language, and other settings can be changed. Refer to “Changing the function settings (when the ignition switch is “ON”)”. ► ...

Caution for installing the child restraint on vehicles with a front passenger airbag
The label shown here is attached on vehicles with a front passenger airbag. Warning ► Extreme Hazard! Do not use a rearward facing child restraint on a seat protected by an airbag in fro ...