Check Macbook Pro Fan operation speed? I am having Macbook Retina(13 inches). How can I check whether laptop's fan is working or not?
There are a few apps that are available to use as Fan Utilities - they will show you current speed, as well as allow you to enable the fans to full blast.  

Here's one I have used previously: 

https://www.macupdate.com/app/mac/23049/smcfancontrol

--
Ed