Power steering issues

Still no power steering most likely the valves in your rack and pinion are not working. Try this Lucas power steering fluid had a vehicle I was working on had hard steering put some of that in and no problem since. The freon if it was not empty before you took of line you may went to take another look at were you made your disconnect it has to be leaking . If you did not disconnect any line look closely at were you had to move A.C line something had to come loose. No sensor on for A.C line unless you are talking about the high low pressure switch that just lets you know if you are low on freon it will cause the compressor clutch to click on and off.

What could be the reason I have to keep adding power steering fluid to my '08 Grand Jeep Cherokee and when I undue my lids to add more fluid there is pressure that pushes out when I open it?