Left fan too much noisy

crwdns2853023:0crwdne2853023:0

Noisy left fan, I tried to clean it but the problem was a defect in cover of the fan (see image) determining a little oscillation of the cover and the noise.

crwdns2853024:0crwdne2853024:0

I simply changed the fan. Now the Mac is noiseless!

crwdns2853025:0crwdne2853025:0

The substitution is very easy, especially using the iFixit instructions.