While comming home from work the other morning my power steering started acting up, when turning the wheel from lock to lock it goes light---heavy---light---heavy and so on, Very strange, Ive checked the belt which is fine and the reservoir is full of fluid.. Theres a little seapage from the rack but not alot, I jacked car up and steering is still the same, Whats my next move? Do the racks give bother? could the steering colum be at fault as when ive jacked up car the steering is still the same#?? Help Cheers