Did you try this:
Bleeding Air From Power Steering Pump:
info provided by lexcoupe94:
STEP 1: Check power steering fluid level. Fill if necessary.
STEP 2: Warm up the car 5 minutes or so to heat up the power steering fluid.
STEP 3: Jack the front end up and prop up on jackstands so that the wheels turn free.
STEP 4: Take off the power steering fluid reservoir cap and stuff a rag around the reservoir to catch any fluid.
STEP 5: With the car running, turn the wheel full left and right about 10 times, then straighten wheels and check fluid.
STEP 6: If fluid level is down, fill to proper hot level and turn full left and right 10 more times.
STEP 7:Repeat until no more air or fluid burps out.
STEP 8:Lower wheels back down and recheck fluid.