I am working on simulating the heat transfer in a assembly that I have made, each component with different heat transfer coefficients.  I have two heat sources, one at 400 C and the other at 2950 C. The main part of the assembly seems to only be affected by the 400 C heat source. The part with the 2950 C heat source doesn't effect the rest of the assembly for whatever reason. I have messed around with bonded component contacts and mesh size but nothing I do helps. 

Thank you