I installed 134a in my van last summer, it was easy and cheap ( kit from Wal Mart ) I just checked the pressure and it has not lost any in just about a year. I knew it was a gamble, but I was not going to spend over $200 to fill system with freon. The total cost was about $30 with a guage and oil mixture-134 mix. I drove from Seattle to Salt Lake and it kept cool and kept the wife happy. It worked for me.

Ken Fry 89 Wolfi 
Thanks to the list I know it is a Bluestar