What may be causing the air from my air conditioner to start getting warmer?

What is your question?

I added some coolant but it never reached the desired temp on the gauge. It hardly registered at all. After a few minutes of very little improvement, I stopped, fearing that something else may be the problem and I didn't want to make things worse. It did cool better than what it was, which was poorly. The next day, it was 90 degrees and was still cooling at an average capacity. I'm hopeing for a quick fix to get me through the summer because I plan on getting a different car next year. Thanks