your pump might be bad. does the pump sound like it's whining? something in the pump might be causing the fluid to boil. harbor freight sells a laser thermometer that works great. get one and see how hot it's getting. this will give you an idea where the hottest part of the power steering system is. and go from there. how are the hoses? if the fluid is boiling, then they should be getting hot too. if not, it could just be in the pump. fix the other problems too. it might be a combo of everything.