Dino heat and A/C controls

I have also posted this it technical, but, the more potential sources, the better.

Ok. I'm new to the world of Dinos. My 1972 US spec car has A/C and all the regular heat controls. I know it's charged, and working, I can hear the compressor kick in when I turn it on, but, where's the cold air going?

And, how do I use the three sliding knobs on the dash to direct the air, or at least turn off the blast of hot air I'm getting now? I know the middle one controls temperature, but what do the ones on the left and right do?

And yes, I looked in the manual, and can't find a thing about the a/c.

Any and all advice from seasoned Dino folks would be appreciated