We bought our 94 GT vert 4 months ago. The PO stated that he had to recharge the A/C every summer. When we bought the car the A/C was working, a day later it wasn't. I took it to a shop and they replaced the high pressure switch, did a pressure test and recharged the system. It worked for 2 days and started blowing hot air again. How does this system seal? Is it with the crappy O-rings that Ford used for many years? Im losing coolant from somewhere. It passed the pressure test in the shop so Im guessing that when the car is on the road and things are moving around under the hood the vibration is allowing the fittings to flex enough to let the coolant escape. Opinions?