I have a brand new 2014 turbo'd pro, last weekend while I was out in Revelstoke riding I stopped on the trail on the way out and looked under the hood. My coolant reservoir was full of tiny air bubbles, almost looked foamy. After letting it sit for a few minutes all the bubbles went away and it looked normal again. The engine temperature was fine, and the trail was real rough. I was told by a fairly reliable source that this was normal for the Polaris, but its been bugging me ever since then. Could these bubbles have been because of the rough trail? Or maybe something a bit more serious?