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!!. -----Original Message----- From: mailing-list-owner@xxxxxxxxxxxxxxxx [mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of Bar00n Sent: April 27, 2003 8:22 AM To: mailing-list@xxxxxxxxxxxxxxxx Subject: Re: IML: 68, R134 conversion Not having fixed my AC in my car yet (I'm in Los Angeles, it doesn't get hot enough to use it) I've perused the web for a low-cost option for R134 etc. R12 has the disadvantage of being banned (something about ozone depleting) and expensive. R134 has the disadvantage of being inefficient and toxic. It appears tht the HC-12a is the best solution, it's a hydrocarbon blend which is more efficient, cheaper and non-toxic. The higher efficiency means that you need to use LESS of it to aquire the same results, this translates to lower cost. It also requires no retrofitting of seals and hoses so it's a straight dropin replacement. Carl http://www.robdiesel.com