I could, but I am not going to. It is a specialized job to regas. By using a can of refrigerant, you do not know how much if any is in the system. Too much, is worse than not enough. You could get liquid refrigerant into the pump, which will destroy it. You might have a leak, which means any you put in will just come out again, if air has got into system, you will get internal corrosion. which will cost you a lot more in the long run.
SD, June 2012
