The rear heater/air conditioner has an 8-speed blower. The required air throughput can be selected from the 8 blower speeds using a rocker switch. The selected setting is shown by a wedge-shaped indicator in the display, with each blower speed being represented by 2 segments. The blower is actuated according to a pre-determined curve in the automatic blower programme. The FHK is switched off when the blow zero speed is selected.