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Posted by KJPRO on August 19, 2008, 12:34 am
> 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?
Change nothing and use R-406a... just requires you to install a couple port
adapters and refrigerant stickers.
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Posted by lp13-30 on August 19, 2008, 10:08 pm
I had heard that 409 was not recommended for cars, but forgot the
reason. Also, I seem to recall seeing a TP chart as well as a graph that
compared it to 12. The graph had the temp horizontally and the pressure
vertically. It seems to me that around 30 deg more or less, the 409
pressure was actually lower than that of 12, but as the temp increased,
it got higher than 12. but the two lines stayed fairly close throughout
the normal temp range found in refrigeration, but at a certain point the
409 line shot damn near straight up. I don't remember what that temp
was, but it was well within the range of what you could expect to see on
auto a/c. When I worked in refrigeration, we used a lot of 409 in ice
machines and it worked great. It is not good for cars, or small cap tube
systems. FWIW, I dumped two cans of Freeze 12
in my GMC the beginning of summer and it is still cooling great. The R4
comp is leaking some at the seal. I have a brand new --not rebuilt--comp
that I'm going to have a friend install for me this winter and recharge
it with 12.( He has a garage and owes me some favors) Last week I got
two partial jugs of HotShot, along with a bunch of other misc stuff,
from a guy who is retiring from a/c and ref service. I have never tried
HotShot before, but have heard it is pretty good. Any comments welcome!
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> 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?