A good friend of mine has a 97 taurus and she was having issues with her battery I jumped her off a few times after about the third day or so her power steering started getting stiff. Also about the same time her fuse for the ciggarette lighter blew out. I replaced the fuse and still issues with the steering I figured well **** must be the pump. I changed out the pump put in new fluid and still issues. Weird thing is I can start the car drive it around really slow less then about 20 to 25 mph and the power steering works perfect. The second I get faster then that and get the rpms up then the steering goes out. It gets really stiff like there is no power steering at all. I can stop the car turn it off and immedately restart the car and the power steering is back till I get speed up again. Once it gets stiff it stays stiff. Even when I slow back down it's still stiff till I turn the car off and back on. I've talked to many many mechanics and no one has ran into this issue. I've had a couple tell me there might be a pressure valve or switch that is holding too much pressure or not enough that needs to be released or replaced. I have no idea where it would be located on the car. Any kind of help would be great thanks.