80 20r ac belt adjustment
 

My 80 has factory, or maybe dealer option ac??? The belts all of a sudden loose. Call me stupid but I don't see any damn way to adjust this thing. What am i missing?

If it has a smog pump, that is your tensioner pulley.
If not, it needs a AC bracket with a tensioner pulley.
I need one of these pulley brackets myself.

Yep, on my the smog pump is the tensioner.

FWIW, it doesn't give much room to tension, so if the belt is at all worn it'll likely need replaced.