I have a 2005 Vulcan 800 classic, I had to ship it to Korea and had to drain the cooling system. I filled the cooling resivoir but the radiator is still empty. When I run the bike is there a thermostate that opens to fill the radiator or do I need to fill the radiator manually. If so how? I drained more out of it than I could put back in so I know it is not full. Any help is appreciated thanks. Please e-mail