Does this model only have a single fan?
It sounds like the fan on my Mac is going as I can hear the bearings in it grinding. I am trying to confirm (before opening the whole thing up) if this model has only a single fan in it. There appears to only be an "optical drive" fan guide on this site, but when I search online for replacement parts I get results for both an optical drive fan and a cpu fan.
Is this a good question?