I have a small leak coming from the Schrader Valve to the AC refrigerant hook up. I charged up the AC and I could hear a hissing sound coming from the valve. I tighted up the valve but it hissed more. So I loosened it and it almost came to a stop. So I decided to change it. Well easier than said.
I got the proper tool to loosen the valve. Problem it wont com out. I pulled on it and it wont come out. I used needle nose plyers. and I still wouldn't come out. So it is still in and hissing. I have to top up with 13a every once in a while.
Has any one run in to this?

Thank in advance for your suggestions.