Best replacement for R12

Posted by Optimum on August 17, 2008, 5:33 pm

There are a few older vehicles on the road running with R12. R134 is'nt a
great replacement, but are there any superior to R401a (dupont MP39) for
performance and changeover ease? I assume standard accumulators, expansion
valves, etc. are suitable for this. Is it mandatory to switch over to
alkylbenzene oil from mineral oil? 401a is not cheap. Is the cost difference
from R12 too little to justify the possible additional labor?

Posted by Don Ocean on August 17, 2008, 8:45 pm

Optimum wrote:

> There are a few older vehicles on the road running with R12. R134 is'nt a
> great replacement, but are there any superior to R401a (dupont MP39) for
> performance and changeover ease? I assume standard accumulators, expansion
> valves, etc. are suitable for this. Is it mandatory to switch over to
> alkylbenzene oil from mineral oil? 401a is not cheap. Is the cost difference
> from R12 too little to justify the possible additional labor?

Try R414B and/or R416A With the proper valve adapters, oil and markers.

>
>

Posted by Don Ocean on August 17, 2008, 8:47 pm

Optimum wrote:

R12 is about $80 lb/retail.. That should make you insure that the system
is leak free.

>
>

Posted by Stormin Mormon on August 18, 2008, 8:48 am

With cars, I don't think there is anything "leak free". External drive
compressors are usually leaky.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.

R12 is about $80 lb/retail.. That should make you insure that the system
is leak free.

Posted by Don Ocean on August 18, 2008, 6:27 pm

Stormin Mormon wrote:

> With cars, I don't think there is anything "leak free". External drive
> compressors are usually leaky.

Ford used York rebuildable compressors for years and the Mopar
compressor systems remain leak free for long perios of time. The old GM
rotaries leaked about 15% per annum right from the factory. I have an
older Chrysler minivan with dual air and it has not been touched in
200,000 miles. Which is unusual as the evaporators tend to break down
and leak after about 7 to 8 years. Nasty job.. Have to drop the steering
column on those. Honda's seldom are leakers also.. I don't know about
the rest. I have replaced a crapper load of compressors, filter driers
and metering devices on a lot of vehicles. My biggest and best pay are
on Big all wheel-drive farm tractors. Those farmers will not work
without their tunes and A/C. Most of those rigs have satellite computers
to control fertilizing and seed setting by Landsat satellite. Power
comfort seat also has to be in good operating condition.

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