Hey guys, just thought I would pick your brains about an A/C concern I have. I recently replaced the compressor on my 95 GT due to a bad clutch coil. The clutch wouldn't engage when power was applied to it. Anyhow, I figured I would replace the compressor as well. I just don't know how old the compressor was. Anyhow, I replace it and the o-rings that go with it. I also replaced the o-rings on the high side hose, since it felt a little loose (figured it was a bad seal). Anyhow, I vacuumed the system as best as I could (one hour at 40PSI on a Harbor Freight vacuum). I then began to charge the system. My gauges were ****, and I couldn't really get a good reading... I said forget it, and took it to work with me (I work for a Toyota Dealer). I then set it up on the A/C machine and was about to evac the system and recharge it. I evacuated 1.42lbs of freon. Looks like I was almost there. I then charged it with the recommended 2.1lbs of freon. The A/C was blowing pretty cold. I got it down to 52 degrees at idle. When I would drive, it would get colder (it felt like 40 degrees. Anyhow, now I notice when I am coming to a stop, or in stop and go traffic, the A/C isn't as cold. Sometimes it'll get pretty "vent" like air coming from it. I do notice, if I'm driving at highway speeds or cruise at a constant speed, the A/C is blowing pretty cold. I was thinking it was low on freon and I have a leak somewhere. But, it's filled 100%. I was starting to think the UDPs I have on the stang are under driving the A/C compressor. I've recently replaced the Low Pressure Switch as well with a new one. I also have a Mishimoto Radiator. Engine temps have always been around 212 and have gotten up to 220 on a hot summer day. I'm wondering if the T-Stat isn't getting stuck. A hot motor could get the A/C to start cutting out... I'm kinda stumped at this point.