Last year, I was putting a can of R-134 in it every 2 weeks or so (where it was back to the point of cycling on and off every 5 seconds), and it was really starting to get on my nerves.
This summer, I tried some of the freon mixed with a "system-safe" leak sealer. I did a little bit of research before I bought it, and didn't see too many negative reviews saying "this blew up my entire car, etc.", so I decided to give it a try. My dad had previously used the stuff in their old '87 Buick Century that had been converted over to R-134, and it worked great in that til the day it was attacked by a truck and we sold it.
Anyway, I first put this stuff in my car in mid-April, when it began to get rainy and my windows kept fogging up. Since then, I have put maybe 1 1/2 more cans of it in, and for the last month (checked it this afternoon), it was still holding a steady pressure at 35 psi from what I filled it to (75 degrees outside) and is still ice cold in the hot weather we've been having.
So...and as much as I don't believe in "miracle products"...this stuff really works!...for now.
I, of course, have to say that while I recommend it, and people here generally recommend against using leak-sealers in any automotive system, I have had success with it, but I, Matt, or MVS isn't responsible if you try it and your AC system explodes
