old fan was noisy-- not that old really-- apple replaced it 2 years ago.

Meu Problema

old fan was noisy and possibly in danger of quitting

Minha Solução

Perfect-- took about half hour-- most time consuming part was all the little screws in the computer body. One small glitch was I did not have any fresh circuit board tape.

Meu Conselho

Don't know if your repair kit includes that yellow tape but it might be an idea.