I have a car with a leaky AC and had to refill it with refrigerant in order to identify the source of the leak. My luck, the evaporator core seems to be the problem and I have to drain the system before I can do the repair.
I did look into a few recovery machine sur as this one, but they are not cheap and for something I am likely to use twice in a lifetime, I was wondering if there were cheaper alternatives to it (appart from asking a mechanics to do it for me, which I am also considering :-)
So far, I have a vacuum pump, which I thought could somehow be used to recover the refrigerant.
Could I maybe hook it up to a Vacuum chamber, with a filter in between so that the refrigerant is decontaminated and can then be reinjected into the system once fixed?
Not sure these Vacuum chambers are made for such things though.