Steve,

I now know why my skepticism of this cure is warranted, there's nothing like glass beads circulating with your refrigerant to ensure a healthy compressor!

Ron,

I don't understand your comment about doing it yourself. If you can do 134 yourself, you can do 12 yourself. As a matter of fact, a set of R12 manifold gauges are cheaper than r134a gauges. You can go online and take the 609 certification test so you can purchase R12, it costs $15 to take the test. You then go to the shop and have them recover the R12, then repair the system, buy the R12, evacuate and charge.

I will reiterate Steve's wise advice; "R12 is the least expensive component in the system." And to reiterate Suginami's warning, he said he'd "been there, done that."

Again, the 124 MB is NOT a good candidate for an alternate refrigerant. I am quite sure you will be disappointed if you spend all this money and time, stay with 134 and find that if you're lucky you will have a marginal a/c system.

Good luck and I hope you make the right decision,