Is it normal for the blower fan to always be on? The three fan buttons (low/auto/high) seem to work but with none of them depressed, the fan still runs at the auto speed. The only way to shut off the fan is to push the "off " button on the horizontal series of switches (far right). According to the manual the off button should only be actuated briefly to block odors and during a car wash-why I don't know.

This climate control seems to be very counter intuitive. Any thoughts? By the way, it is an '87 (W124). Thanks.