Not sure what’s going on but I had this happen to me last winter. When it got extremely cold I noticed when I turn the steering wheel it felt really stiff/hard to turn the wheel. Once spring/summer come up power steering felt fine. Now here we are in winter again and now my steering is very stiff again. I checked the power steering reservoir and it was just below the cold low level. I topped it up to cold top level. Adding the fluid didn’t improve anything. Any ideas on what’s going on here? Is this the start to costly repairs? Once when warm weather comes back the steering will probably go back to normal. I don’t see any leaks!!