Ive got two air conditioners for a 2nd gen ram 50/mightymax. one is a mitsubishi system and the other is a mixture of american made components from chrysler and others. so far im leaning towards using the mitsubishi made system since it appears to be more thought out and integrated to the truck but i did notice that the dealer add on one seems to use more off the shelf parts like the expansion valve, eccs (electronic clutch cycling switch), and the sanden sd508 compressor which might give me better options for which refrigerant i charge it with. one of my biggest questions is what refrigerant should i try to use? obviously R12 would be ideal since thats what they were designed to use but i hear its expensive and rare and i live in a small area so there may not even be anyone who deals with it locally. all of the R12 substitutes seem to be on the way to being phased out and R134a from what i hear isn't as efficient as R12 and all of the seals need to be changed out (no biggie since most of the system is not installed) i guess i will need to see what the local ac shops say but i wanted to get some input here first to see if anyone has some advice since im totaly new to ac.
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