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Topic: Converting the A/C from R-12 to R 134A (Read 189 times) previous topic - next topic
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Converting the A/C from R-12 to R 134A
Is it possible to convert the coach a/c using the R-12 refrigerant into the new R 134-A system?
Re: Converting the A/C from R-12 to R 134A
Reply #1 –
SASSY1, you didn't say what model and year Lazy Daze you have (those are good things to add to your signature), but for what it's worth, in 2001 I had my 1985 LD's cab air conditioner converted to use the newer refrigerant. It cost me $1,100 back then; probably would cost more now.
Andy Baird
2021 Ford Ranger towing 2019 Airstream 19CB
Previously: 1985 LD Twin/King "Gertie"; 2003 LD Midbath "Skylark"
Re: Converting the A/C from R-12 to R 134A
Reply #2 –
Yes you can change systems. An A/c professional  must evacuate the existing system  and capture the old gasses. Then the old valve must be replaced with a size that will accept the new refrigerant because it’s a different size. Some shops will still fill it with R-12 but it is very expensive. You’re better off changing over.
Dale from Downey 27’ 2012 RB,”Casa Verde”, 2000 Jeep Wrangler. Formerly1991 RB & 1990 Jeep Wrangler.
Re: Converting the A/C from R-12 to R 134A
Reply #3 –
Beside changing the valves to 134A quick disconnect valves, the system must be totally flushed with a specialize cleaner to remove the R12 PAG oil , it is not comparable with the new 134A PAG oil that needs to be added with the new refrigerant.
It’s a big project that will not cool as well as the original R12.

Larry
Larry
2003 23.5' Front Lounge, since new.  Previously 1983 22' Front Lounge.
Tow vehicles  2020 Jeep Wrangler Rubicon, 2001 Jeep Cherokee
Photo Collection: Lazy Daze
Re: Converting the A/C from R-12 to R 134A
Reply #4 –
Thank you all, much appreciated...it was for a '93 model that I was considering to purchase, I've since decided not to buy that unit and will continue to look for my "one"...that I know it's out there :-)...safe travels...