If the system was stock, and it should be, you may have too much zone in it. Low should read about 30-35 at 2K, and in those temps 95 w/45% relative, should be cooling in the low 40's. But that is if you have the correct system. I would reccomend that you find a shop with real ac equipment that can flush the system out, and put R12 back into it. A real ac machine can flush the entire system by adding twice the amount of liquid zone in it, and pumping it through the system backwards for about two hours. 134 works on higher pressures and it tends to destory 12 compressors over time, and then add in a mix of the 12 and 134 oils that dont mix too well. A good flush can save your ac system. That and I laugh everytime I see a sight glass on a 134 system. You charge by a thermomiter and pressures, thats it. You look at the sight glass on a 134 system and charge it that way, you will have too much zone in it everytime.