MISSY2684

I noticed that I frequently have to put power steering fluid in my car..I do buy the stop leak kind but I find myself every 3-4 months putting more in it. I also realzed that when it is cold outside no mater how much I warm up my car there is a whirring sound the same sound it makes when it needs power steering fluid but I check and there is plenty of fuid in there. The noise doesn't stop for a while as well. Is there something wrong the sound is worse on the inside of the car than outside but it drives me nuts...it doesn't sound too healthy.