How many fans does the Macbook Pro late 2011 15 inch have?

Helio
I've been using my mac for about two years and always took it to maintanance. I want to know if this model has two fans or only one. I use an application called
smcfancontroller which tells me there is two fans however the left fan is the only one that works.

Here are tear-downs you can count them yourself, and possibly repair them if broken:
https://www.ifixit.com/Device/MacBook_Pro_15%22_Unibody_Late_2011

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