Vacuum problem and n00b question...
 

So I've been working on my car for a while, and ever since I got it there was a vacuum leak. I could hear the hissing coming out from the dash. Is the AC compressor part of that? because I know that needs replacing, and I plan on doing that later this week. I'm also curious as to what all of the vacuum accessories are. My second n00b question is rather embarrassing. So I know that there's the little knob to adjust the left side mirror, but what about the right? I've looked around and there's no toggle near the joystick to switch from side to side, and it's missing from the other side. I also don't see it anywhere on the dash or mounted on the steering wheel. Is it just meant to be adjusted by hand?
thanks,
Austin