Ice freezing up evaporator on the Ford recovered refrigerant low 920 g 

Little low on refrigerant not too bad. It has another problem not due to being low on refrigerant

[@electric_thumbs]

So since I'll probably flush at least the hoses for the system would it be okay to use shop air just for that as long as the hoses are not connected to the rest of the system in our separately Open to the atmosphere end to end?