Not saying this is wrong with yours Joey, but this was in my rad. and cooling system. mine overheated first time out,so i moved it up in the back cage. when i dumped rad out , this came out of it. For some reason the anti-freeze had some kind of reaction. the can am rep told my dealer that this happend in a couple of the test maverick's. I move all my radiator's up cause of mud anyway. but still i was'nt happy about this shit in my 20k ride. So i did'nt use stock rad, I got a universal car rad and flushed the system with a hayden fan mod and now no problems at all with temp running hot. It also had straight anti freeze in it ,not 50/50 mix. I agree with A Reed , it's probably just a air pocket . Just had to vent a little about this stuped shit in my radiator. Any way good luck with your's.