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Originally Posted by magwakeenercew2jh
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Its made of fairy dust and the supply is diminishing..
The new stuff R134A is supposed to be less harmful to the environment yet at the same time they (gov) tightens up the regulations for proper disposal and tax the crap out of R12 So you cant afford it. Same deal with residential/commercial (buildings) R410A, R407C vs R22 same but different... Really there are probably thousands of different refrigerants. If you vent it... on the subject of oil, well the oil is carried by the freon so if you cut a line you lose oil, if you create a tiny leak the oil stays, mostly. The collision guys have specific recharge amounts for oil based on crash damage. the more important part (at least what they tell you in commercial) is to plug all components once freon is removed. This is because the oil is (probably going to butcher the word) hydroscopic: "absorbs moisture". Why do you care? your PAG oil absorbing moisture can coagulate and clog (turn to fatty mush) the system and fail to lubricate. So what ever you do put some rubber plugs, plastic cap plugs etc in the hose ends, compressor fittings etc. It is much easier to drain an automotive AC compressor than try to flip a Copeland Scroll compressor over to drain and replace the POE oil.... But I can say I have used a used Automotive compressor that was stored open and drained and replaced the oil without issue.. The deal with evac'ing the system (using a vacuum pump) is to suck down the atmosphere to remove atmospheric moisture and better accept the freon charge. Yet I have charged a vehicle without a vacuum pump and it worked great. I guess it can depend on your climate (humidity). When working on an open system whether brazing or screw on fittings we use a nitrogen purge (dry air nitrogen) to displace oxygen for oxidization (copper oxide dust inside) and nitrogen displaces atmospheric air (think moisture/humidity). Sorry for the lesson and I may not be 100% accurate due to fluid ingestion and BTW I was born in Kalifornia, no hard feelings although pelosi could fall off a cliff...