Quote:
Originally Posted by alex77ae
But than again... you get a recovery machine and pump out all the old r134a and than add new r134a to the right pressure.
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The key there is that it is a "recovery" machine. It literally takes the freon out of your system, separates the oil from the freon, and then holds YOUR "old" freon in a tank. When they are done replacing parts, seals / vacuum testing - they will actually put your "old" freon right back in. If the system was low when it came in they will add enough freon to get it back up to spec. If the system was empty, of course you will get all "new" freon.
If ever I have my A/C worked on, I always put PAG oil with dye in. It makes future leaks easy to detect and IMO saves time and money down the road.