2017 was fine, this year couple weeks into the season (June) I noticed some overheat errors and after checking under the seat I noticed there was no coolant. Filled that up and within a week another warning. Now, I can ride for about an hour and it's needs more again but I can't figure out what to check or where to start. It doesn't leak if just idle only if I run it. Where should I start my search, how can I tell?