Is the heat sink solid metal?
I have a MacBook Pro that operates in extreme cold temperatures and it appears that the heat sink ruptured in the cold operating climate. We've never had this problem with our original MacBook Core Duo. The heat sink looks like it is a solid bar or metal to draw the heat away to the fan. Can anyone confirm this?
No it will not be solid. There is a heat pipe linking the different components together. The heat pipe is filled with a liquid. Usually some form of ammonia. It draws heat away using the same principles as a refrigeration unit. You will need to replace heat sink. You can find instructions for doing that here.