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I am in the process of removing the heater box so i can replace the heater core (it is leaking and I believe it is shot) I have it all loose and disconnected but when I try and lift it out it feels like something is holding it in at the top of the heater box. I disconnected everything that I could physically reach from inside the car and it all loosend up nicely but that last little bit wont come out & I can tell its at still hooked to something at the top. I have not clue what it is still attached to. Does anyone have any info to help me out???? I really dont have an interest in breaking anything in the process.  

why don't you just have a pro look at it?