The radiator in my 2004 V6 Explorer needs to be changed, I have reviewed the Ford instructions and the process seems pretty straightforward. However, I have a question about the process. The steps say that the transmission cooler lines must be disconnected so the cooler and radiator can come out as a unit. Is this necessary, or can the trans cooler be disconnected from the radiator "assembly" (leaving the lines attached) while still in the vehicle?