True, true. "EPA doesn't like anything that takes money from them" hehe There's the flammability issue, but in a properly functioning system it won't matter, so I would still go ahead with it. Some of my peers have opted to drive to Mexico to buy Freon to push into their systems instead. Carl http://www.robdiesel.com ----- Original Message ----- From: "Ernie Stepney" <stepney@xxxxxxxxx> All concerned with retrofitting to hc12a should take a look at this web site.http://www.epa.gov/ozone/snap/refrigerants/hc-12a.html#q1. The stuff is not approved for automotive use!!.