As you may already know..R12 = CDC or (Chlorofluorocarbon) 134A = HFC or (Hydrofluorocarbon) 409 = HCFC or (Hydrochlorofluorocarbon). To be honest with you I don't know too much about it except that it is typically used in appliances. I worked as an appliance repairman for a short while a long time ago and the gentleman who owned the business told me he put it in his MB's and mixed it directly with R12 with no ill side effects. I took his word for it and put some in mine not too long ago. It has been working and cooling fine ever since.
1957 Dodge D100
1967 VW Microbus 21 Window
2004 Beach cruiser bicycle
"It cannot be emphasized too strongly or too often that this great nation was founded not by religionists, but by Christians; not on religion, but on the Gospel of Jesus Christ. For that reason alone, people of other faiths have been afforded freedom of worship here." Patrick Henry 1776
Last edited by drbrandini; 01-08-2003 at 12:21 AM.