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134a back to R12?
Posted: Sat Feb 24, 2018 7:06 am
by Inca32
I have 1975 corvette that has been changed to 134a, old air Pro6Ten compressor & condensor by previous owner. What would I have to do to change it back to R12?
Re: 134a back to R12?
Posted: Sat Feb 24, 2018 8:31 am
by bohica2xo
That will depend on how it was converted.
Which oil was used in the conversion?
Other than the compressor, is the balance of the system the original design?
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Re: 134a back to R12?
Posted: Sat Feb 24, 2018 11:05 am
by Inca32
Not much was done other then compressor (pag46 oil), I installed new condensor and green seals on it because old condensor had black seals. Everything else is probably factory from the looks of the components.
Re: 134a back to R12?
Posted: Sat Feb 24, 2018 11:21 am
by bohica2xo
So no flushing or VIR service?
Re: 134a back to R12?
Posted: Sat Feb 24, 2018 5:41 pm
by Inca32
VIR looks to be in touched don’t know about flushing but think it must have been performed.
Re: 134a back to R12?
Posted: Sun Feb 25, 2018 8:57 pm
by bohica2xo
If the VIR was not serviced, the system was not flushed. It is not possible to flush through a VIR
The desiccant bag in the VIR is part of the service - so if the VIR looks "untouched" - it has a 40+ year old desiccant bag that is not 134a compatible inside of it...
The system also still has a few ounces of mineral oil in it.
To do the restoration to R12 requires that you flush the condenser & evaporator completely, pull the VIR & service it on the bench. Then flush the compressor with fresh oil of the type you plan to use with the R12. Hoses & hard lines need to be flushed too.
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