Hi all- I have an 05 WR450 with a strange cooling system mystery. I have to refill my overflow bottle after every ride. I filled my radiators to the specifications in the manual, but I seem to be losing coolant. I haven't noticed any overflow from the radiators or the overflow bottle while riding. I willl be checking my oil tonight. I am going to put it in a clean pan and let it sit for a couple of hours to see if any of the water seperates from the oil. If i find anything in the oil, I'm sure it's the impeller seal on the engine side. I know the other one is okay because there is no coolant coming from the weep hole. I replaced my impeller and seals in july. I'm thinking I may have put the seal in backwards. Other than the impellar seal, what else should I check while I'm at it? Where else do you guys see coolant loss?