John, You may be correct about all this, but I think the kit at Advanced Auto, or Wal-mart, has something special in it that makes R12, and R134a oils compatable. I've converted a Jetta, AC system. I rebuild the compressor, and replaced the condensor at the time. Vacuumed out the system, and that thing will freeze you out, today. That was 3 years ago. I'll be doing another one here soon. Eric John Connolly wrote: >Just a word of warning; most R-12 and R-134a comes with oil (lubricant) in >the proper proportions pre-mixed in the can. THE OILS ARE NOT COMPATIBLE. If >you put in R-134a without a complete oil change (the compressor contains >5-7oz of oil) and system flush, you made a major boo-boo. Ask me how I know. > >the systems are compatible with one another, but it requires a time >consuming system flush (I used a flush kit, and Mineral Spirits, along with >my air compressor). You have to take everything apart, and replacing the >o-rings is a wise move since they are already apart. Replacing the expansion >valve and dryer ( a good idea, and a MUST, respectively) round out the job. >THEN you can put your lubricant and refrigerant of choice into the system, >following the proper charging procedures (vacuuming out the system, then a >charge). > >If you mix R12 and R-134a oils, you will more then likely find out why this >is not a good idea. The combination does nasty stuff to the dessicant in the >dryer, and the resulting system contaminants will destroy you compressor in >short order. Like I said, ASK ME HOW I KNOW. > >John >Aircooled.Net Inc. > > > > |
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