This switch panel is designed for heating the cabins of Volvo trucks, with the product code 21396148 84171527-15. The panel is equipped with three main rotary buttons to control various climate functions:

• Upper buttons: Control of the airflow direction, indicated by graphical symbols for feet, face, and windshield defrosting.
• Center button: Temperature adjustment, with a blue color indicator for cold air and red for hot air.
• Lower button: Fan speed control, with options from 0 (Stop) to 4 speed levels.

At the bottom of the panel are additional symbols for ventilation and defrost modes, as well as a dedicated button for activating the air conditioning.