i changed the coolant a month or so ago, and my bike was running fine. now all the sudden its back running hot again, and much worse this time. ill be riding through town and the bike climb to 215 after riding for a little bit. i ran it for a while then brought it home the other day and let it idle and it was reaching 239 with the fan running. i turned it off to be safe. im wondering if its air still caught in the cooling system. what i assume is the bleeder valve bolt on the water pump is nearly stripped from me trying to get it off. is there another way to do this?