Heater question

[StevieC]

I'm flushing out my my 65 radiator and don't know where the heater control is to flush out the heater core as well.
Anybody know where the heater temperature control is or does it have one?
All I see is a pull knob that says air and it turns three clicks, I'm assuming that's the fan control and vent?

The heater core was disconnected and the lines looped back to the motor by the PO because the core was leaking. I hooked the lines back up and hope to use some bars leak or something to fix the core... does that ever work?

Thanks guys!