What heater controls should I have?

[SlimPikins]

I only have two heater controls on my dash. One is the fan, and the other switches between defrost and floor. I have been looking at switches online and everything I see is a four switch set, and they all say deluxe. In 63, was having four switches an option? I have searched around the heater box in the cab and do not see a lever that would control the temperature. Does anyone know what the fourth switch is? I'm assuming that three of them are def/floor, temp and fan. Any insight from the members would be greatly appreciated.

Thanks,
Slim.


Here is a pic of my controls.