My dealer told me that my my motor got very hot at some time due to the air bubble in the coolant. I asked how he knew it that it got hot . He just said that he could tell. Arctic Cat told them to put new rings in my sled and bleed the coolant the propper way. My question is what can happen to the rest of the motor when exposed to this kind of heat ? Will this effect the lifespan of my machine ? I bought a new sled to avoid such worries . I think Artic Cat should offer a free 3 year warrenty to people like myself with motor problems . If not I am going to be forced to sell my sled at the end of the season due to realiability issues .