Tarak1980

I have a Coleman HS400UTV-5 got it manly for hunting and spending time with the grandkids The one problem I am trying to avoid. My son borrowed it last summer and said it ran hot so he added water to it . I do not know how much he put in so I would like to drain most of it and add new coolant to protect it this winter. I can find no drain cock or any way of draining it besides loosening a hose. Any suggestions ????