2007 Chevrolet Malibu thermal expansion valve replacement

My 07 malibu A/C is blowing hot air, at one point. The freon was right. Then. I let freon out in hopes to replace with. New now I'm going to have to manually jump the compressor. To get the freon back to where it belongs, I know, I'll be right back where I started at that point, after hrs of research I now find myself humbly asking you how I change this thermal valve. And am I headed in the right direction in your professional opinion? Please help