There are 2 problems, yes. My side fans were fine but a few people's side fans arrived with loose or missing nuts/bolts. Tighten all 4 of them and if there is a screw without a nut, rescue it before it gets lost.
The other sound could be a belt riding up the side of a pulley but much more likely - it is the extruder losing steps. Look at the extruder on the back of your UM when you hear the click does it rotate backwards? If so you are printing too cold (or too fast). Here is a table of how fast you can print with the UM2 and with the blue pla that comes with um2 and with various temperatures:
http://umforum.ultimaker.com/index.php?/topic/3418-um2-extrusion-rates/
I'm pretty sure you are going WAY over those limits. Just raise the temp based on your printing speed. e.g. at 100mm/sec with .2mm layers you need to be at least 230C.
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Nicolinux 288
It sounds "circular". I guess it is a fan.
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