NJFBOA - Home of New Jersey's Camaros and Firebirds - View Single Post - R-12 to R-134A?

Stevoone · 05-20-2016, 07:24 AM

If you go to any major parts store you can request a retrofit kit. It will include new service fittings, a few valves and a sticker indicating that the vehicle has R134 instead of R12. I would also recommend replacing at least the receiver/dryer (the canister looking piece) they have a desiccant bag inside of them to adsorb moisture and will also retain some of the old oil. After that I run a vacuum on the system for 30 min or so.

That is the way I've done a majority of my retrofits and have never had an issue. The correct procedure is to disassemble and flush all of the old oil from the system, refill oil, replace dryer and TXV or orifice tube, vacuum then recharge

The new charge weight is 90% of the original. If you had an original charge of 3lbs R12 your new charge would be roughly 2.7lbs or 2lbs 12 oz with R134.

05-20-2016, 07:24 AM	#6
Stevoone Join Date: Mar 2007 Location: NJ Posts: 540 iTrader: (2)	If you go to any major parts store you can request a retrofit kit. It will include new service fittings, a few valves and a sticker indicating that the vehicle has R134 instead of R12. I would also recommend replacing at least the receiver/dryer (the canister looking piece) they have a desiccant bag inside of them to adsorb moisture and will also retain some of the old oil. After that I run a vacuum on the system for 30 min or so. That is the way I've done a majority of my retrofits and have never had an issue. The correct procedure is to disassemble and flush all of the old oil from the system, refill oil, replace dryer and TXV or orifice tube, vacuum then recharge The new charge weight is 90% of the original. If you had an original charge of 3lbs R12 your new charge would be roughly 2.7lbs or 2lbs 12 oz with R134.