there isn't one for A/C. Since it's on the same belt as the alternator you use the Alternator tensioner to tighten it.
Like she said above. Loosen #30 and turn 16...you have to loosen all the 30's...
And the ALT belt adjuster is right under neath the alternator two bolts,just agian slightly loosen the alternator main bolts so the act like hinges.