Where is coolant filled at on 2003 Vulcan vn2000?

On a 2003 Vulcan VN2000, the coolant is filled at the radiator reservoir. You can find the reservoir on the right side of the bike, near the front. It typically has a cap marked for coolant, and you can check the coolant level through the transparent side of the reservoir. Always ensure the engine is cool before opening the cap to avoid any injuries.