Istat pro exhuast fan reading 0rpm

I have a 13 inch MacBook that I got in 2011, not an Air or a Pro. But by fan was making a strange noise (starting just two days ago) it was almost like a purring, but I was sure that it was my fan. About three hours ago I opened it up and it wasn't making the noise anymore so I was concerned  as to whether or not my fan was working at all. So I downloaded Istat pro, and in the fans category, it has one spot for the exhaust which reads 0rpm. I started freaking out, thinking that my fan has failed, but for the past few hours now the temp of the CPU and pretty much everything else has stayed between 30 and 55 degrees Celcius? I kind of freaking out here, because I don't know what this means.
Any tips, comments, suggestions are appreciated!
(My battery does need to be replaced, if that info helps any.)

Run the Apple hardware test to see if it shows any sensor or hardware issues.  When prompted, run the extended test, which can take over an hour to run.

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