2006 rav 4 temperature control does not seem to be working.

It's probably exactly what you think it is: it's not connected to anything. If I remember correctly, the knob connects to a cable on these and the cable moves the blend door. Sounds like somewhere along the way, your cable has become disconnected or dislodged. Repair could involve something as simple as a simple as re-installing the cable, or as complex and pricey as replacing broken components that the cable attached to. Impossible to know without disassembly and inspection.