There are differing opinions on this but this is what my cousin says...he owns a very professional and successful garage so I trust him. Disassemble the system, take the hoses off, throw away the dryer (buy a new one) flush out the condensor, compressor, evapourator and lines using a proper AC system flush solution. Replace any incompatile O rings and hoses. Reassemble and fill with R-134a. I am about to try a product called Red-Tek. This product is a drop-in solution for an older R-12 system. Red-Tek is compatible with the older components and the R-12 type oil. There is also a product called Duracool that is very much the same. I'll let you know my experience with this product. ----- Original Message ----- From: "aeyn" <mr85000@xxxxxxxxx> To: <mailing-list@xxxxxxxxxxxxxxxx> Sent: Monday, July 17, 2006 12:53 PM Subject: IML: Change Over for 1975 AutoTemp Is there a guide in the club's listings of the parts and the Equipment needed to change from an R-12 Freon A/C system to an R134a A/C system. I know that some of us have already done this. I would very much appreciate this. My A/C is not working currently. Æyn & Patrick ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm