I am changing my heater core and I cant get the lower hose off. I cut it to get it off the heater core and now I cant get to the clamp on the bottom side because of the way it is put on so how do I get this off of there. Any help is greatly appreciated. Also when I put the new heater core in does it go in that black case and then put in it or do i put the heater core in by itself and try to get that case around it? One more question. I took out the lower panel and removed a silver box. Does this box plug into anything at the top from that plastic long peg looking thing. I didnt disconnect any off the wires. Thanks for any help.