My air conditioner got hot inside turned off car and it was cold then hot again?

What is your question?

I had to shut the air off and when I turned it back on it was cold again, but a few minutes later got warm again. Stopped to repair shop they said the pressure was good. I decided to find a place tomorrow that has a computer to diagnose but wondering if anyone else with a V50 has had this happen and what could it be?