Page 1 of 1
Running R12 In A R134 System
Posted: Fri Aug 30, 2019 4:28 pm
by philipswanson
I am rebuilding the air conditioning system in my motorhome. It is a 1995 so it came with R134 from the factory. I am thinking about going backwards and converting it to an R12 system to make it run cooler. I have plenty of R12 so that's not a consideration. Question is: Is a system designed for R134 capable of running R12 with no ill effects? Naturally it would be totally purged and run with Esther oil.
Re: Running R12 In A R134 System
Posted: Fri Aug 30, 2019 8:07 pm
by Cusser
I'm probably wrong, but I thought that R-12 was only legal in systems originally built for R-12.
I still have an R-12 truck, but will confess that my 1998 and 2004 Frontiers and 2005 Yukon with factory R134a are really cold, and I'm in Phoenix AZ.
Re: Running R12 In A R134 System
Posted: Sat Aug 31, 2019 9:33 am
by philipswanson
Not illegal. But can it be done mechanically? That's the question.
Re: Running R12 In A R134 System
Posted: Sun Sep 01, 2019 7:21 am
by Cusser
philipswanson wrote:Not illegal. But can it be done mechanically? That's the question.
With the equipment I already have at my home, I could technically fill an R134a system with R-12, and vice-versa. Without changing/converting either of the service valves.
Re: Running R12 In A R134 System
Posted: Sun Sep 01, 2019 11:20 am
by philipswanson
What about the expansion valve? Doesn't that need to be changed to run R12? Some valves specify R134.
Re: Running R12 In A R134 System
Posted: Sun Sep 01, 2019 5:24 pm
by Dougflas
philipswanson wrote:What about the expansion valve? Doesn't that need to be changed to run R12? Some valves specify R134.
R12 and R134 are so close I would not change it