Ls1 A/c issue

[Camarofan2000]

So a few months back I replaced the ac compressor, evap, and orifious tube on my ls1 camaro. Everything was done properly vacuum and checked for leaks. Added oil and freon, then it was all working right and blowing cold. A few months later it was nice out on the way to work so I turned it off and rolled the windows down. Then turned it back on later on that day and it was blowing warm. Also it seems to get coolish while on the highway. Fans are on, clutch and compressor are engaged. The low pressure and high pressure are as follows. Vehicle off L 101 psi. H 120 psi. Vehicle running with a/c on L 78 psi. H 130 psi. I'm stumped please help.