| the 414 is a gas Ray and the evacuation pump is a gas pump . Just like the compressor pump is a gas pump . What specifically “gets ruined” ? I don’t buy that story . At all . As far as 134 goes in the stock system that apparently works and may a short term or long term success , depending if you know what you are doing and do it right . However any one who really knows refrigeration also knows the 134 needs totally different refrigeration oil and you HAVE to get ALL the old oil out . Which to do that right , means taking off compressor as oil sits in the bottom . There is oil in the dryer ( easy — a new one ) and in the core and hoses / lines too ( not easy ) . second , the expansion valve characteristics are matched to the refrigerant . ( look up the system operating pressures and temps of 12 and 134 , wildly different— 134 is way higher in a system designed for it ) . Yes the old expansion valve may work some but probably 50-60 % of cooling of a correct one designed for 134 . Which probably won’t fit our 1960 fittings without lots of difficult rework . It is not as good as R12 at removing heat for a given flow , but it sure beats no AC and protects the environment . So a reasonable approach widely done by pros who know how . easier if all apart for restoration anyway . If you believe refrigeration engineers , done wrong with mixed or wrung oils takes out the compressor etc. However when ever we succeed , sort of , it seems great . leave it at that . Kind of like kerosene in gas tank . 134 can be used yes , but you CANNOT just drop it in . Well you can I guess . Seems to me you l may totally wreck your AC system unless you do it right . Just read up on all this ! especially the lube oil .
-- There are no warnings on 414 about any kind of damage to anything and I do not buy there is any , it’s pressures are very similar to 12 ( unlike 134) and it is compatible with R12 oil . By design . It was made to do this exact job . Our systems have no o rings the joints are copper flare fittings . Your mileage may vary . Whatever Sent from my iPhone not by choice Do NOT use any that has Propane in it. If you ever have to have it serviced, the Propane will ruin the evacuation machine and you will have a very pissed off service tech. They may even demand you pay for the damages. It's been many years since Propane laced refrigerant was used as a supposed substitute, and these "accidents" were happening, and things change so check with your service guy. I converted my Dakota to 134-A and you can get a kit off the shelf @ Walmart for about $15-20. It includes conversion valves to add to your original charging valves for the bigger hose connectors, and a bunch of seals for all the hose connections. Takes about an hour to do it. I sucked it down, held the vacuum to verify no leaks and then charged it with the 134-A. As I recall, it was as cold if not colder than the original and I never touched it again. I sold it several years later and it was blowing cold then. Ray On Wed, Sep 29, 2021 at 4:38 PM John Grady <jkg@xxxxxxxxxxxxxxxxx> wrote: I found a refrigerant that can be used directly , I think R 414 , JY Chouinard up in Canada tried it before I had need to, he says works great ( 300F) . -- Ray Jones. Y'all come on down an see us. Ya hear?
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