FHave Sanyo model SR-4310 fridge. There is now a hole in one of the pipes from the compressor, (it's a long story, but, needless to say, the refrigerant is long gone and the fridge doesn't cool anymore). I’m planning to buy replacement part "evaporator assembly sr360w." After replacing the part, how do I get rid of the air in the system and get the new refrigerant in there?