Hope the info I give is right....If you say it's the A/C and the powersteering, then it's probably the tension of both belts.
Tighten the A/C belts tension from the idler pulley mount bolt
#17
Loosen the top and bottom bolts that mounts the powersteering to the engine, bring the powersteering closer to the front of the vehicle for more tension, then tighten both bolts.
Both bolts listed as #6
I've had problems like that countless times, but be careful not to tighten the A/C pulley TOO MUCH. I just readjusted my tension last week, and a day later I was driving and my pulley fell off and the mount bent.... lol