I bought my 1st new car in 1967. It was a VW of course. It had one lever between the seats to control the heat. That lever was part of the 200 odd upgrades done for the 67 model year. I traded it in for another new VW in 69. It had the new front and rear heater controls. I recall you pulled the left lever up to turn the heat on, and the raised the right lever to distribute heat to the rear floor vents. The heater control was red and the rear control arm was white.