Re: Air Conditioning temp
I'd start with over/under charge. The only accurate method to charge it is to weigh it in. Most cars take between 18-22oz (r134a). I always inject IR dye too because they all leak eventually.
Every car I've ever AC serviced ran about 35^ at the vents. This varies, will not be accurate for a car with climate control unless you know how to run it without the CC blending air. My '95 talon always ran 35ish. That was after it was running for a 10 minutes + and driving it, on recirc and cooled off in the car. Again all these numbers vary wildly with temps so take it with a grain of salt.
So I would make sure your charge is weighed in accurately. If you didn't weigh it in, you could try figuring it out with sub-cool and super-heat calcuations (these can be rough). In the end I've always had to recovery, vacuum, and wiegh it in.
If you weighed it in and all seems accurate I'd want to start looking at guages, pressures, sub-cool, and super-heat. It could be many things at this point, including a TXV, clog somewhere.