Did a very chilly 75 miles today - how on earth does the heater work?

94 plus 8, there's a push pull knob under the steering wheel that seems to do nothing much and a rocker switch on the dash that looks like it should work a blower but doesn't? (furthest right)

thoughts welcome, thanks

Gary


2012 Plus 4 in Sport Green. Much comfier than the Plus 8!