So I know my Wii was overheating. The warranty was expired so I took it apart to see if i could fix it.
Turns out Nintendo used some crappy thermal paste that shrinks as it gets old.
there is a good nickle thickness between the heat sink cpu and gpu :-O
So I filed down the posts on the heat sink so it now sits flat on the cpu and gpu.
You must use good thermal paste.
I used little springs to keep the ground to the heat sink working :)