Hey Guys!
Last year when I had a freon leak in our 1995 3.8L Transport, I was urged to repair it myself. I went to a local autozone, and purchased the freon sealer, air conditioner system oil, and freon.
Not only has it working this year, it works VERY well. When I refilled the freon, I used a product called Sub Zero. My Pontiac trans mechanic friend said that was the new synthetic type of freon. I had to use a number of cans to refill the system at the time, and I definitely used the pressure gauge that is dialed to the ambient temperature when I filled the system.
My point is that the air conditioning definitely was significantly colder. I would estimate about 25% colder. I do not recall ever having air conditioning in our van ever working that well. It is definitely worth the money during this extremely hot summer near Chicago....cheers