I am having a great deal of trouble getting off the lines to the heater core. They have some sort of hydraulic style line with a plastic clip that doesnt come off the way it looks like it does (if that makes any sense). If I knew how they worked it would deffinetly aid me. I got one off but was unsure how I did it. this is definatly a pita! I am pissed off that I have to drain out the a\c to replace it but i guess its better than having no heat in the winter and overheating. I am desperatley in need of some help!